    shared.conns.lock().unwrap().insert(
        id,
        ConnEntry {
            conn: conn.clone(),
            remote_id_hex: remote_id_hex.clone(),
            proven_subnets,
        },
    );

    shared.conns.lock().unwrap().insert(
        id,
        ConnEntry {
            kind: ConnKind::Quic(conn.clone()),
            remote_id_hex: remote_id_hex.clone(),
            proven_subnets,
        },
    );


proceed with W1.5 next steps. first verify the plan with doyle


The file C:\Users\decid\Documents\projects\spt-core\crates\spt-daemon\src\nethost.rs has been updated successfully. (file state is current in your context — no need to Read it back)

    shared.conns.lock().unwrap().insert(
        id,
        ConnEntry {
            conn: conn.clone(),
            remote_id_hex: remote_id_hex.clone(),
            proven_subnets,
        },
    );

    shared.conns.lock().unwrap().insert(
        id,
        ConnEntry {
            kind: ConnKind::Quic(conn.clone()),
            remote_id_hex: remote_id_hex.clone(),
            proven_subnets,
        },
    );

+            kind: ConnKind::Quic(conn.clone()),


Edit

        while let Ok((send, recv)) = conn.accept_bi().await {
            register_stream(&sh, id, &hex, send, recv, false);
        }

        while let Ok((send, recv)) = conn.accept_bi().await {
            register_stream(
                &sh,
                id,
                &hex,
                SendHalf::Quic(send),
                RecvHalf::Quic(recv),
                false,
            );
        }


        while let Ok((send, recv)) = conn.accept_bi().await {
            register_stream(&sh, id, &hex, send, recv, false);
        }

        while let Ok((send, recv)) = conn.accept_bi().await {
            register_stream(
                &sh,
                id,
                &hex,
                SendHalf::Quic(send),
                RecvHalf::Quic(recv),
                false,
            );
        }

-            register_stream(&sh, id, &hex, send, recv, false);


Now update `register_stream` signature + read pump to accept the halves:


fn register_stream(
    shared: &Arc<NetShared>,
    conn_id: u64,
    remote_id_hex: &str,
    send: SendStream,
    recv: RecvStream,
    initiated_locally: bool,
) -> u64 {
    let id = shared.next_stream_id.fetch_add(1, Ordering::Relaxed);
    let log = Arc::new(Mutex::new(StreamLog::new(id, shared.ring_cap)));
    shared.streams.lock().unwrap().insert(
        id,
        Arc::new(StreamEntry {
            conn_id,
            remote_id_hex: remote_id_hex.to_string(),
            initiated_locally,
            send: tokio::sync::Mutex::new(send),
            log: Arc::clone(&log),
        }),
    );

    // The read pump — the stream's single producer. A clean end (peer finish)
    // and a torn end (conn lost) both finish the log; the buffered chunks stay
    // replayable either way.
    let mut recv = recv;
    tokio::spawn(async move {
        loop {
            match recv.read_chunk(STREAM_READ_CHUNK).await {
                Ok(Some(chunk)) => log.lock().unwrap().append(&chunk.bytes),
                Ok(None) | Err(_) => {
                    log.lock().unwrap().finish();
                    break;
                }
            }
        }
    });

    id
}

fn register_stream(
    shared: &Arc<NetShared>,
    conn_id: u64,
    remote_id_hex: &str,
    send: SendHalf,
    recv: RecvHalf,
    initiated_locally: bool,
) -> u64 {
    let id = shared.next_stream_id.fetch_add(1, Ordering::Relaxed);
    let log = Arc::new(Mutex::new(StreamLog::new(id, shared.ring_cap)));
    shared.streams.lock().unwrap().insert(
        id,
        Arc::new(StreamEntry {
            conn_id,
            remote_id_hex: remote_id_hex.to_string(),
            initiated_locally,
            send: tokio::sync::Mutex::new(send),
            log: Arc::clone(&log),
        }),
    );

    // The read pump — the stream's single producer. A clean end (peer finish)
    // and a torn end (conn lost) both finish the log; the buffered chunks stay
    // replayable either way. The transport differs only at this read leaf
    // (QUIC chunk API vs the loopback duplex's `AsyncRead`); both append to the
    // same `StreamLog`, so nothing above the pump can tell them apart.
    tokio::spawn(async move {
        match recv {
            RecvHalf::Quic(mut recv) => loop {
                match recv.read_chunk(STREAM_READ_CHUNK).await {
                    Ok(Some(chunk)) => log.lock().unwrap().append(&chunk.bytes),
                    Ok(None) | Err(_) => {
                        log.lock().unwrap().finish();
                        break;
                    }
                }
            },
            RecvHalf::Loopback(mut recv) => {
                let mut buf = vec![0u8; STREAM_READ_CHUNK];
                loop {
                    match recv.read(&mut buf).await {
                        Ok(0) | Err(_) => {
                            log.lock().unwrap().finish();
                            break;
                        }
                        Ok(n) => log.lock().unwrap().append(&buf[..n]),
                    }
                }
            }
        }
    });

    id
}


fn register_stream(
    shared: &Arc<NetShared>,
    conn_id: u64,
    remote_id_hex: &str,
    send: SendStream,
    recv: RecvStream,
    initiated_locally: bool,
) -> u64 {
    let id = shared.next_stream_id.fetch_add(1, Ordering::Relaxed);
    let log = Arc::new(Mutex::new(StreamLog::new(id, shared.ring_cap)));
    shared.streams.lock().unwrap().insert(
        id,
        Arc::new(StreamEntry {
            conn_id,
            remote_id_hex: remote_id_hex.to_string(),
            initiated_locally,
            send: tokio::sync::Mutex::new(send),
            log: Arc::clone(&log),
        }),
    );

    // The read pump — the stream's single producer. A clean end (peer finish)
    // and a torn end (conn lost) both finish the log; the buffered chunks stay
    // replayable either way.
    let mut recv = recv;
    tokio::spawn(async move {
        loop {
            match recv.read_chunk(STREAM_READ_CHUNK).await {
                Ok(Some(chunk)) => log.lock().unwrap().append(&chunk.bytes),
                Ok(None) | Err(_) => {
                    log.lock().unwrap().finish();
                    break;
                }
            }
        }
    });

    id
}

fn register_stream(
    shared: &Arc<NetShared>,
    conn_id: u64,
    remote_id_hex: &str,
    send: SendHalf,
    recv: RecvHalf,
    initiated_locally: bool,
) -> u64 {
    let id = shared.next_stream_id.fetch_add(1, Ordering::Relaxed);
    let log = Arc::new(Mutex::new(StreamLog::new(id, shared.ring_cap)));
    shared.streams.lock().unwrap().insert(
        id,
        Arc::new(StreamEntry {
            conn_id,
            remote_id_hex: remote_id_hex.to_string(),
            initiated_locally,
            send: tokio::sync::Mutex::new(send),
            log: Arc::clone(&log),
        }),
    );

    // The read pump — the stream's single producer. A clean end (peer finish)
    // and a torn end (conn lost) both finish the log; the buffered chunks stay
    // replayable either way. The transport differs only at this read leaf
    // (QUIC chunk API vs the loopback duplex's `AsyncRead`); both append to the
    // same `StreamLog`, so nothing above the pump can tell them apart.
    tokio::spawn(async move {
        match recv {
            RecvHalf::Quic(mut recv) => loop {
                match recv.read_chunk(STREAM_READ_CHUNK).await {
                    Ok(Some(chunk)) => log.lock().unwrap().append(&chunk.bytes),
                    Ok(None) | Err(_) => {
                        log.lock().unwrap().finish();
                        break;
                    }
                }
            },
            RecvHalf::Loopback(mut recv) => {
                let mut buf = vec![0u8; STREAM_READ_CHUNK];
                loop {
                    match recv.read(&mut buf).await {
                        Ok(0) | Err(_) => {
                            log.lock().unwrap().finish();
                            break;
                        }
                        Ok(n) => log.lock().unwrap().append(&buf[..n]),
                    }
                }
            }
        }
    });

    id
}

+    // replayable either way. The transport differs only at this read leaf

+    // (QUIC chunk API vs the loopback duplex's `AsyncRead`); both append to the

+    // same `StreamLog`, so nothing above the pump can tell them apart.

-            match recv.read_chunk(STREAM_READ_CHUNK).await {

-                Ok(Some(chunk)) => log.lock().unwrap().append(&chunk.bytes),

-                    log.lock().unwrap().finish();

+            RecvHalf::Quic(mut recv) => loop {

+                match recv.read_chunk(STREAM_READ_CHUNK).await {

+                    Ok(Some(chunk)) => log.lock().unwrap().append(&chunk.bytes),

+                        log.lock().unwrap().finish();

+            RecvHalf::Loopback(mut recv) => {

+                let mut buf = vec![0u8; STREAM_READ_CHUNK];

+                    match recv.read(&mut buf).await {

+                            log.lock().unwrap().finish();

+                        Ok(n) => log.lock().unwrap().append(&buf[..n]),


Now add `loopback_conn` field to NetHost struct + its constructor. Find the struct literal in `start()`:


496:pub struct NetHost {
519:    roster: Arc<Mutex<Option<RosterExchange>>>,
522:impl NetHost {
637:        Ok(NetHost {


515	    /// so the many hermetic test configs need no change — a roster exchange is a
516	    /// layer atop the proof, opt-in per host). `None` ⇒ no roster leg. Read +
517	    /// cloned per connect on the net runtime, so the accept loop (spawned in
518	    /// `start`, before the host exists) shares it through this `Arc`.
519	    roster: Arc<Mutex<Option<RosterExchange>>>,
520	}
521
522	impl NetHost {
523	    /// Bind the broker's endpoint on a fresh dedicated runtime and start the
524	    /// accept loop. The endpoint speaks TWO ALPNs (M7 D3, REQ-SUBNET-2): the

    /// so the many hermetic test configs need no change — a roster exchange is a
    /// layer atop the proof, opt-in per host). `None` ⇒ no roster leg. Read +
    /// cloned per connect on the net runtime, so the accept loop (spawned in
    /// `start`, before the host exists) shares it through this `Arc`.
    roster: Arc<Mutex<Option<RosterExchange>>>,
}

impl NetHost {
    /// Bind the broker's endpoint on a fresh dedicated runtime and start the
    /// accept loop. The endpoint speaks TWO ALPNs (M7 D3, REQ-SUBNET-2): the


    roster: Arc<Mutex<Option<RosterExchange>>>,
}

impl NetHost {

    roster: Arc<Mutex<Option<RosterExchange>>>,
    /// The broker's single in-process loopback connection (M12 W1.5, B1),
    /// minted lazily on the first [`Self::dial_loopback`] and reused thereafter
    /// — a local `spt rc` needs exactly one. `Some(conn_id)` once minted; the
    /// row lives for the host (no handshake to lose, no closed-watcher).
    loopback_conn: Mutex<Option<u64>>,
}

impl NetHost {


    roster: Arc<Mutex<Option<RosterExchange>>>,
}

impl NetHost {

    roster: Arc<Mutex<Option<RosterExchange>>>,
    /// The broker's single in-process loopback connection (M12 W1.5, B1),
    /// minted lazily on the first [`Self::dial_loopback`] and reused thereafter
    /// — a local `spt rc` needs exactly one. `Some(conn_id)` once minted; the
    /// row lives for the host (no handshake to lose, no closed-watcher).
    loopback_conn: Mutex<Option<u64>>,
}

impl NetHost {

/// cloned per connect on the net runtime, so the accept loop (spawned in

/// `start`, before the host exists) shares it through this `Arc`.

+    /// The broker's single in-process loopback connection (M12 W1.5, B1),

+    /// minted lazily on the first [`Self::dial_loopback`] and reused thereafter

+    /// — a local `spt rc` needs exactly one. `Some(conn_id)` once minted; the

+    /// row lives for the host (no handshake to lose, no closed-watcher).


641
642	        Ok(NetHost {
643	            runtime,
644	            endpoint,
645	            shared,
646	            dial_ops: Mutex::new(HashMap::new()),
647	            stream_ops: Mutex::new(HashMap::new()),
648	            local_id: local_pub,
649	            membership: cfg.membership,
650	            roster,
651	        })
652	    }
653
654	    /// Wire the on-connect roster-exchange seam (Mesh-D4, REQ-MESH-2) onto this
655	    /// live host. The daemon calls this once after `start` with
656	    /// [`crate::seedproofx::production_roster_exchange`]; tests inject their own.

        Ok(NetHost {
            runtime,
            endpoint,
            shared,
            dial_ops: Mutex::new(HashMap::new()),
            stream_ops: Mutex::new(HashMap::new()),
            local_id: local_pub,
            membership: cfg.membership,
            roster,
        })
    }

    /// Wire the on-connect roster-exchange seam (Mesh-D4, REQ-MESH-2) onto this
    /// live host. The daemon calls this once after `start` with
    /// [`crate::seedproofx::production_roster_exchange`]; tests inject their own.


            membership: cfg.membership,
            roster,
        })
    }

            membership: cfg.membership,
            roster,
            loopback_conn: Mutex::new(None),
        })
    }


            membership: cfg.membership,
            roster,
        })
    }

            membership: cfg.membership,
            roster,
            loopback_conn: Mutex::new(None),
        })
    }

+            loopback_conn: Mutex::new(None),


Now `dial_loopback` + `open_stream` loopback branch + `conn_remote_addr_json` Loopback→Null. Re-locate (lines shifted):


Grep

pub fn dial\(|let conn = \{|e.conn.clone\(\)|pub fn open_stream|fn conn_remote_addr_json|fn conn_count


698:    pub fn conn_count(&self) -> u64 {
706:    pub fn dial(&self, addr: EndpointAddr) -> io::Result<(u64, String)> {
788:    pub fn conn_remote_addr_json(&self, conn_id: u64) -> serde_json::Value {
789:        let conn = {
792:                Some(e) => e.conn.clone(),
807:    pub fn open_stream(&self, conn_id: u64) -> io::Result<u64> {
813:            (e.conn.clone(), e.remote_id_hex.clone())


786	    /// serialize: the seed is an optimization, never an error path.
787	    // [impl->REQ-CONV-1]
788	    pub fn conn_remote_addr_json(&self, conn_id: u64) -> serde_json::Value {
789	        let conn = {
790	            let conns = self.shared.conns.lock().unwrap();
791	            match conns.get(&conn_id) {
792	                Some(e) => e.conn.clone(),
793	                None => return serde_json::Value::Null,
794	            }
795	        };
796	        let addr = spt_net::net::endpoint::conn_remote_addr(&conn);
797	        if addr.is_empty() {
798	            return serde_json::Value::Null; // id-only adds nothing over discovery
799	        }
800	        serde_json::to_value(addr).unwrap_or(serde_json::Value::Null)
801	    }
802
803	    /// Open a bidi stream on a held connection, registering it (with its read
804	    /// pump) in the stream table (D4b). Note QUIC streams are lazy: the peer
805	    /// sees the stream on its first write.
806	    // [impl->REQ-DAEMON-2]
807	    pub fn open_stream(&self, conn_id: u64) -> io::Result<u64> {
808	        let (conn, remote_id_hex) = {
809	            let conns = self.shared.conns.lock().unwrap();
810	            let e = conns.get(&conn_id).ok_or_else(|| {
811	                io::Error::new(io::ErrorKind::NotFound, format!("no such conn {conn_id}"))
812	            })?;
813	            (e.conn.clone(), e.remote_id_hex.clone())
814	        };
815	        let shared = Arc::clone(&self.shared);
816	        self.runtime.handle().block_on(async move {
817	            let (send, recv) = conn
818	                .open_bi()
819	                .await
820	                .map_err(|e| io::Error::other(e.to_string()))?;
821	            Ok(register_stream(
822	                &shared,
823	                conn_id,
824	                &remote_id_hex,
825	                send,
826	                recv,
827	                true,
828	            ))
829	        })
830	    }
831
832	    /// Record that journaled open `op_id` minted `stream_id` (inside the
833	    /// `apply_once` closure — same discipline as [`Self::record_dial_op`]).
834	    pub fn record_stream_op(&self, op_id: u64, stream_id: u64) {
835	        self.stream_ops.lock().unwrap().insert(op_id, stream_id);

    /// serialize: the seed is an optimization, never an error path.
    // [impl->REQ-CONV-1]
    pub fn conn_remote_addr_json(&self, conn_id: u64) -> serde_json::Value {
        let conn = {
            let conns = self.shared.conns.lock().unwrap();
            match conns.get(&conn_id) {
                Some(e) => e.conn.clone(),
                None => return serde_json::Value::Null,
            }
        };
        let addr = spt_net::net::endpoint::conn_remote_addr(&conn);
        if addr.is_empty() {
            return serde_json::Value::Null; // id-only adds nothing over discovery
        }
        serde_json::to_value(addr).unwrap_or(serde_json::Value::Null)
    }

    /// Open a bidi stream on a held connection, registering it (with its read
    /// pump) in the stream table (D4b). Note QUIC streams are lazy: the peer
    /// sees the stream on its first write.
    // [impl->REQ-DAEMON-2]
    pub fn open_stream(&self, conn_id: u64) -> io::Result<u64> {
        let (conn, remote_id_hex) = {
            let conns = self.shared.conns.lock().unwrap();
            let e = conns.get(&conn_id).ok_or_else(|| {
                io::Error::new(io::ErrorKind::NotFound, format!("no such conn {conn_id}"))
            })?;
            (e.conn.clone(), e.remote_id_hex.clone())
        };
        let shared = Arc::clone(&self.shared);
        self.runtime.handle().block_on(async move {
            let (send, recv) = conn
                .open_bi()
                .await
                .map_err(|e| io::Error::other(e.to_string()))?;
            Ok(register_stream(
                &shared,
                conn_id,
                &remote_id_hex,
                send,
                recv,
                true,
            ))
        })
    }

    /// Record that journaled open `op_id` minted `stream_id` (inside the
    /// `apply_once` closure — same discipline as [`Self::record_dial_op`]).
    pub fn record_stream_op(&self, op_id: u64, stream_id: u64) {
        self.stream_ops.lock().unwrap().insert(op_id, stream_id);


Edit

    pub fn conn_remote_addr_json(&self, conn_id: u64) -> serde_json::Value {
        let conn = {
            let conns = self.shared.conns.lock().unwrap();
            match conns.get(&conn_id) {
                Some(e) => e.conn.clone(),
                None => return serde_json::Value::Null,
            }
        };
        let addr = spt_net::net::endpoint::conn_remote_addr(&conn);

    pub fn conn_remote_addr_json(&self, conn_id: u64) -> serde_json::Value {
        let conn = {
            let conns = self.shared.conns.lock().unwrap();
            match conns.get(&conn_id) {
                // A loopback conn has no path to observe — nothing to seed.
                Some(e) => match &e.kind {
                    ConnKind::Quic(c) => c.clone(),
                    ConnKind::Loopback => return serde_json::Value::Null,
                },
                None => return serde_json::Value::Null,
            }
        };
        let addr = spt_net::net::endpoint::conn_remote_addr(&conn);


    pub fn conn_remote_addr_json(&self, conn_id: u64) -> serde_json::Value {
        let conn = {
            let conns = self.shared.conns.lock().unwrap();
            match conns.get(&conn_id) {
                Some(e) => e.conn.clone(),
                None => return serde_json::Value::Null,
            }
        };
        let addr = spt_net::net::endpoint::conn_remote_addr(&conn);

    pub fn conn_remote_addr_json(&self, conn_id: u64) -> serde_json::Value {
        let conn = {
            let conns = self.shared.conns.lock().unwrap();
            match conns.get(&conn_id) {
                // A loopback conn has no path to observe — nothing to seed.
                Some(e) => match &e.kind {
                    ConnKind::Quic(c) => c.clone(),
                    ConnKind::Loopback => return serde_json::Value::Null,
                },
                None => return serde_json::Value::Null,
            }
        };
        let addr = spt_net::net::endpoint::conn_remote_addr(&conn);

-                Some(e) => e.conn.clone(),

+                // A loopback conn has no path to observe — nothing to seed.

+                Some(e) => match &e.kind {

+                    ConnKind::Quic(c) => c.clone(),

+                    ConnKind::Loopback => return serde_json::Value::Null,


Now `open_stream` — branch on ConnKind, plus add `dial_loopback` before it:


    /// Open a bidi stream on a held connection, registering it (with its read
    /// pump) in the stream table (D4b). Note QUIC streams are lazy: the peer
    /// sees the stream on its first write.
    // [impl->REQ-DAEMON-2]
    pub fn open_stream(&self, conn_id: u64) -> io::Result<u64> {
        let (conn, remote_id_hex) = {
            let conns = self.shared.conns.lock().unwrap();
            let e = conns.get(&conn_id).ok_or_else(|| {
                io::Error::new(io::ErrorKind::NotFound, format!("no such conn {conn_id}"))
            })?;
            (e.conn.clone(), e.remote_id_hex.clone())
        };
        let shared = Arc::clone(&self.shared);
        self.runtime.handle().block_on(async move {
            let (send, recv) = conn
                .open_bi()
                .await
                .map_err(|e| io::Error::other(e.to_string()))?;
            Ok(register_stream(
                &shared,
                conn_id,
                &remote_id_hex,
                send,
                recv,
                true,
            ))
        })
    }

    /// Mint (or reuse) the broker's single in-process loopback connection
    /// (M12 W1.5, B1) and return `(conn_id, remote_id_hex)` — `remote_id_hex` is
    /// THIS node's own id, so a stream served over it gates same-node (access
    /// short-circuit Allow). The conn carries NO iroh handshake: its identity is
    /// broker-minted BY CONSTRUCTION and can never arise from an inbound dial.
    /// This is what lets a LOCAL `spt rc` ride the byte-identical `serve_attach`
    /// pump — QUIC self-dial is refused by iroh, so local attach uses this.
    /// Idempotent: every call returns the same singleton conn (one is all a
    /// local attach needs); no journaling needed (reuse is the dedup).
    // [impl->REQ-RC-1]
    pub fn dial_loopback(&self) -> (u64, String) {
        let remote_id_hex = self.local_id.to_hex();
        let mut slot = self.loopback_conn.lock().unwrap();
        if let Some(id) = *slot {
            return (id, remote_id_hex);
        }
        let id = self.shared.next_conn_id.fetch_add(1, Ordering::Relaxed);
        self.shared.conns.lock().unwrap().insert(
            id,
            ConnEntry {
                kind: ConnKind::Loopback,
                remote_id_hex: remote_id_hex.clone(),
                proven_subnets: HashSet::new(),
            },
        );
        *slot = Some(id);
        (id, remote_id_hex)
    }

    /// Open a bidi stream on a held connection, registering it (with its read
    /// pump) in the stream table (D4b). Note QUIC streams are lazy: the peer
    /// sees the stream on its first write.
    ///
    /// On a [`ConnKind::Loopback`] conn there is no peer to accept the stream,
    /// so the open mints a CROSS-WIRED PAIR in-process: an operator row
    /// (`initiated_locally = true`, the returned id) and a peer row
    /// (`initiated_locally = false`) the inbound dispatcher claims and serves via
    /// `serve_attach` — exactly as an `accept_bi` would surface a remote-opened
    /// stream. One `tokio::io::duplex` wires both directions; each row's read
    /// pump and `StreamLog` are the SAME machinery the QUIC path uses (the W1.5
    /// one-pump invariant). The peer row's `remote_id_hex` is this node's own id,
    /// so its serve gates same-node.
    // [impl->REQ-DAEMON-2]
    // [impl->REQ-RC-1]
    pub fn open_stream(&self, conn_id: u64) -> io::Result<u64> {
        enum Backing {
            Quic(Connection),
            Loopback,
        }
        let (backing, remote_id_hex) = {
            let conns = self.shared.conns.lock().unwrap();
            let e = conns.get(&conn_id).ok_or_else(|| {
                io::Error::new(io::ErrorKind::NotFound, format!("no such conn {conn_id}"))
            })?;
            let backing = match &e.kind {
                ConnKind::Quic(c) => Backing::Quic(c.clone()),
                ConnKind::Loopback => Backing::Loopback,
            };
            (backing, e.remote_id_hex.clone())
        };
        let shared = Arc::clone(&self.shared);
        match backing {
            Backing::Quic(conn) => self.runtime.handle().block_on(async move {
                let (send, recv) = conn
                    .open_bi()
                    .await
                    .map_err(|e| io::Error::other(e.to_string()))?;
                Ok(register_stream(
                    &shared,
                    conn_id,
                    &remote_id_hex,
                    SendHalf::Quic(send),
                    RecvHalf::Quic(recv),
                    true,
                ))
            }),
            Backing::Loopback => self.runtime.handle().block_on(async move {
                // One duplex carries BOTH directions: operator writes reach the
                // peer's read pump and vice-versa. Split each end into a read +
                // write half so each row owns exactly its leg.
                let (op_io, peer_io) = tokio::io::duplex(STREAM_READ_CHUNK);
                let (op_r, op_w) = tokio::io::split(op_io);
                let (peer_r, peer_w) = tokio::io::split(peer_io);
                // Register the peer (inbound) row first so it is in the table
                // before the operator can write its Request onto the wire — the
                // dispatcher must never miss the stream.
                register_stream(
                    &shared,
                    conn_id,
                    &remote_id_hex,
                    SendHalf::Loopback(peer_w),
                    RecvHalf::Loopback(peer_r),
                    false,
                );
                Ok(register_stream(
                    &shared,
                    conn_id,
                    &remote_id_hex,
                    SendHalf::Loopback(op_w),
                    RecvHalf::Loopback(op_r),
                    true,
                ))
            }),
        }
    }


    /// Open a bidi stream on a held connection, registering it (with its read
    /// pump) in the stream table (D4b). Note QUIC streams are lazy: the peer
    /// sees the stream on its first write.
    // [impl->REQ-DAEMON-2]
    pub fn open_stream(&self, conn_id: u64) -> io::Result<u64> {
        let (conn, remote_id_hex) = {
            let conns = self.shared.conns.lock().unwrap();
            let e = conns.get(&conn_id).ok_or_else(|| {
                io::Error::new(io::ErrorKind::NotFound, format!("no such conn {conn_id}"))
            })?;
            (e.conn.clone(), e.remote_id_hex.clone())
        };
        let shared = Arc::clone(&self.shared);
        self.runtime.handle().block_on(async move {
            let (send, recv) = conn
                .open_bi()
                .await
                .map_err(|e| io::Error::other(e.to_string()))?;
            Ok(register_stream(
                &shared,
                conn_id,
                &remote_id_hex,
                send,
                recv,
                true,
            ))
        })
    }

    /// Mint (or reuse) the broker's single in-process loopback connection
    /// (M12 W1.5, B1) and return `(conn_id, remote_id_hex)` — `remote_id_hex` is
    /// THIS node's own id, so a stream served over it gates same-node (access
    /// short-circuit Allow). The conn carries NO iroh handshake: its identity is
    /// broker-minted BY CONSTRUCTION and can never arise from an inbound dial.
    /// This is what lets a LOCAL `spt rc` ride the byte-identical `serve_attach`
    /// pump — QUIC self-dial is refused by iroh, so local attach uses this.
    /// Idempotent: every call returns the same singleton conn (one is all a
    /// local attach needs); no journaling needed (reuse is the dedup).
    // [impl->REQ-RC-1]
    pub fn dial_loopback(&self) -> (u64, String) {
        let remote_id_hex = self.local_id.to_hex();
        let mut slot = self.loopback_conn.lock().unwrap();
        if let Some(id) = *slot {
            return (id, remote_id_hex);
        }
        let id = self.shared.next_conn_id.fetch_add(1, Ordering::Relaxed);
        self.shared.conns.lock().unwrap().insert(
            id,
            ConnEntry {
                kind: ConnKind::Loopback,
                remote_id_hex: remote_id_hex.clone(),
                proven_subnets: HashSet::new(),
            },
        );
        *slot = Some(id);
        (id, remote_id_hex)
    }

    /// Open a bidi stream on a held connection, registering it (with its read
    /// pump) in the stream table (D4b). Note QUIC streams are lazy: the peer
    /// sees the stream on its first write.
    ///
    /// On a [`ConnKind::Loopback`] conn there is no peer to accept the stream,
    /// so the open mints a CROSS-WIRED PAIR in-process: an operator row
    /// (`initiated_locally = true`, the returned id) and a peer row
    /// (`initiated_locally = false`) the inbound dispatcher claims and serves via
    /// `serve_attach` — exactly as an `accept_bi` would surface a remote-opened
    /// stream. One `tokio::io::duplex` wires both directions; each row's read
    /// pump and `StreamLog` are the SAME machinery the QUIC path uses (the W1.5
    /// one-pump invariant). The peer row's `remote_id_hex` is this node's own id,
    /// so its serve gates same-node.
    // [impl->REQ-DAEMON-2]
    // [impl->REQ-RC-1]
    pub fn open_stream(&self, conn_id: u64) -> io::Result<u64> {
        enum Backing {
            Quic(Connection),
            Loopback,
        }
        let (backing, remote_id_hex) = {
            let conns = self.shared.conns.lock().unwrap();
            let e = conns.get(&conn_id).ok_or_else(|| {
                io::Error::new(io::ErrorKind::NotFound, format!("no such conn {conn_id}"))
            })?;
            let backing = match &e.kind {
                ConnKind::Quic(c) => Backing::Quic(c.clone()),
                ConnKind::Loopback => Backing::Loopback,
            };
            (backing, e.remote_id_hex.clone())
        };
        let shared = Arc::clone(&self.shared);
        match backing {
            Backing::Quic(conn) => self.runtime.handle().block_on(async move {
                let (send, recv) = conn
                    .open_bi()
                    .await
                    .map_err(|e| io::Error::other(e.to_string()))?;
                Ok(register_stream(
                    &shared,
                    conn_id,
                    &remote_id_hex,
                    SendHalf::Quic(send),
                    RecvHalf::Quic(recv),
                    true,
                ))
            }),
            Backing::Loopback => self.runtime.handle().block_on(async move {
                // One duplex carries BOTH directions: operator writes reach the
                // peer's read pump and vice-versa. Split each end into a read +
                // write half so each row owns exactly its leg.
                let (op_io, peer_io) = tokio::io::duplex(STREAM_READ_CHUNK);
                let (op_r, op_w) = tokio::io::split(op_io);
                let (peer_r, peer_w) = tokio::io::split(peer_io);
                // Register the peer (inbound) row first so it is in the table
                // before the operator can write its Request onto the wire — the
                // dispatcher must never miss the stream.
                register_stream(
                    &shared,
                    conn_id,
                    &remote_id_hex,
                    SendHalf::Loopback(peer_w),
                    RecvHalf::Loopback(peer_r),
                    false,
                );
                Ok(register_stream(
                    &shared,
                    conn_id,
                    &remote_id_hex,
                    SendHalf::Loopback(op_w),
                    RecvHalf::Loopback(op_r),
                    true,
                ))
            }),
        }
    }

+    /// Mint (or reuse) the broker's single in-process loopback connection

+    /// (M12 W1.5, B1) and return `(conn_id, remote_id_hex)` — `remote_id_hex` is

+    /// THIS node's own id, so a stream served over it gates same-node (access

+    /// short-circuit Allow). The conn carries NO iroh handshake: its identity is

+    /// broker-minted BY CONSTRUCTION and can never arise from an inbound dial.

+    /// This is what lets a LOCAL `spt rc` ride the byte-identical `serve_attach`

+    /// pump — QUIC self-dial is refused by iroh, so local attach uses this.

+    /// Idempotent: every call returns the same singleton conn (one is all a

+    /// local attach needs); no journaling needed (reuse is the dedup).

+    pub fn dial_loopback(&self) -> (u64, String) {

+        let remote_id_hex = self.local_id.to_hex();

+        let mut slot = self.loopback_conn.lock().unwrap();

+            return (id, remote_id_hex);

+        let id = self.shared.next_conn_id.fetch_add(1, Ordering::Relaxed);

+        self.shared.conns.lock().unwrap().insert(

+                kind: ConnKind::Loopback,

+                remote_id_hex: remote_id_hex.clone(),

+                proven_subnets: HashSet::new(),

+    /// On a [`ConnKind::Loopback`] conn there is no peer to accept the stream,

+    /// so the open mints a CROSS-WIRED PAIR in-process: an operator row

+    /// (`initiated_locally = true`, the returned id) and a peer row

+    /// (`initiated_locally = false`) the inbound dispatcher claims and serves via

+    /// `serve_attach` — exactly as an `accept_bi` would surface a remote-opened

+    /// stream. One `tokio::io::duplex` wires both directions; each row's read

+    /// pump and `StreamLog` are the SAME machinery the QUIC path uses (the W1.5

+    /// one-pump invariant). The peer row's `remote_id_hex` is this node's own id,

+        let (backing, remote_id_hex) = {

-            (e.conn.clone(), e.remote_id_hex.clone())

+            let backing = match &e.kind {

+                ConnKind::Quic(c) => Backing::Quic(c.clone()),

+                ConnKind::Loopback => Backing::Loopback,

+            (backing, e.remote_id_hex.clone())

-        self.runtime.handle().block_on(async move {

-                .map_err(|e| io::Error::other(e.to_string()))?;

+            Backing::Quic(conn) => self.runtime.handle().block_on(async move {

+                let (send, recv) = conn

+                    .map_err(|e| io::Error::other(e.to_string()))?;

+                    SendHalf::Quic(send),

+                    RecvHalf::Quic(recv),

+            Backing::Loopback => self.runtime.handle().block_on(async move {

+                // One duplex carries BOTH directions: operator writes reach the

+                // peer's read pump and vice-versa. Split each end into a read +

+                let (op_io, peer_io) = tokio::io::duplex(STREAM_READ_CHUNK);

+                let (op_r, op_w) = tokio::io::split(op_io);

+                let (peer_r, peer_w) = tokio::io::split(peer_io);

+                // Register the peer (inbound) row first so it is in the table

+                // before the operator can write its Request onto the wire — the

+                // dispatcher must never miss the stream.

+                    SendHalf::Loopback(peer_w),

+                    RecvHalf::Loopback(peer_r),

+                    SendHalf::Loopback(op_w),

+                    RecvHalf::Loopback(op_r),

/// Record that journaled open `op_id` minted `stream_id` (inside the


nethost.rs T1.5.1/T1.5.2-host done. Now msg.rs frame KIND constant:


50	/// Brain→broker: dial a peer over the broker-owned endpoint (D4a). With an
51	/// `op_id` the dial is exactly-once (journaled like an idempotent `input`).
52	pub const KIND_NET_DIAL: &str = "net-dial";
53	/// Broker→brain: a dial durably landed — fresh or deduped (`applied_now`
54	/// distinguishes, mirroring [`KIND_APPLIED`]). Carries the broker-minted conn id.
55	pub const KIND_NET_DIALED: &str = "net-dialed";
56	/// Brain→broker: open a bidi QUIC stream on a held connection (D4b). With an
57	/// `op_id` the open is exactly-once (journaled like a dial).
58	pub const KIND_NET_STREAM_OPEN: &str = "net-stream-open";
59	/// Broker→brain: a stream open durably landed (fresh or deduped).

/// Brain→broker: dial a peer over the broker-owned endpoint (D4a). With an
/// `op_id` the dial is exactly-once (journaled like an idempotent `input`).
pub const KIND_NET_DIAL: &str = "net-dial";
/// Broker→brain: a dial durably landed — fresh or deduped (`applied_now`
/// distinguishes, mirroring [`KIND_APPLIED`]). Carries the broker-minted conn id.
pub const KIND_NET_DIALED: &str = "net-dialed";
/// Brain→broker: open a bidi QUIC stream on a held connection (D4b). With an
/// `op_id` the open is exactly-once (journaled like a dial).
pub const KIND_NET_STREAM_OPEN: &str = "net-stream-open";
/// Broker→brain: a stream open durably landed (fresh or deduped).


pub const KIND_NET_DIAL: &str = "net-dial";
/// Broker→brain: a dial durably landed — fresh or deduped (`applied_now`
/// distinguishes, mirroring [`KIND_APPLIED`]). Carries the broker-minted conn id.
pub const KIND_NET_DIALED: &str = "net-dialed";

pub const KIND_NET_DIAL: &str = "net-dial";
/// Brain→broker: mint (or reuse) the broker's single in-process loopback
/// connection (M12 W1.5, B1) — the transport a LOCAL `spt rc` rides because QUIC
/// self-dial is refused by iroh. An explicit verb (NOT a sentinel addr on
/// [`KIND_NET_DIAL`]): loopback handling stays isolated from the dial hot path.
/// Null payload (the singleton is idempotent by reuse — no op id, no addr).
/// Answered with a [`KIND_NET_DIALED`] whose `remote_id_hex` is THIS node's own id.
pub const KIND_NET_DIAL_LOOPBACK: &str = "net-dial-loopback";
/// Broker→brain: a dial durably landed — fresh or deduped (`applied_now`
/// distinguishes, mirroring [`KIND_APPLIED`]). Carries the broker-minted conn id.
pub const KIND_NET_DIALED: &str = "net-dialed";


The file C:\Users\decid\Documents\projects\spt-core\crates\spt-daemon\src\msg.rs has been updated successfully. (file state is current in your context — no need to Read it back)

pub const KIND_NET_DIAL: &str = "net-dial";
/// Broker→brain: a dial durably landed — fresh or deduped (`applied_now`
/// distinguishes, mirroring [`KIND_APPLIED`]). Carries the broker-minted conn id.
pub const KIND_NET_DIALED: &str = "net-dialed";

pub const KIND_NET_DIAL: &str = "net-dial";
/// Brain→broker: mint (or reuse) the broker's single in-process loopback
/// connection (M12 W1.5, B1) — the transport a LOCAL `spt rc` rides because QUIC
/// self-dial is refused by iroh. An explicit verb (NOT a sentinel addr on
/// [`KIND_NET_DIAL`]): loopback handling stays isolated from the dial hot path.
/// Null payload (the singleton is idempotent by reuse — no op id, no addr).
/// Answered with a [`KIND_NET_DIALED`] whose `remote_id_hex` is THIS node's own id.
pub const KIND_NET_DIAL_LOOPBACK: &str = "net-dial-loopback";
/// Broker→brain: a dial durably landed — fresh or deduped (`applied_now`
/// distinguishes, mirroring [`KIND_APPLIED`]). Carries the broker-minted conn id.
pub const KIND_NET_DIALED: &str = "net-dialed";

/// Brain→broker: dial a peer over the broker-owned endpoint (D4a). With an

/// `op_id` the dial is exactly-once (journaled like an idempotent `input`).

+/// Brain→broker: mint (or reuse) the broker's single in-process loopback

+/// connection (M12 W1.5, B1) — the transport a LOCAL `spt rc` rides because QUIC

+/// self-dial is refused by iroh. An explicit verb (NOT a sentinel addr on

+/// [`KIND_NET_DIAL`]): loopback handling stays isolated from the dial hot path.

+/// Null payload (the singleton is idempotent by reuse — no op id, no addr).

+/// Answered with a [`KIND_NET_DIALED`] whose `remote_id_hex` is THIS node's own id.

+pub const KIND_NET_DIAL_LOOPBACK: &str = "net-dial-loopback";


Now brain.rs `net_dial_loopback` + import. Check brain.rs KIND imports:


42:    KIND_BRAIN_RESTARTED, KIND_ERROR, KIND_EXIT, KIND_INPUT, KIND_KILL, KIND_NET_DIAL,
45:    KIND_NET_STREAM_DATA, KIND_NET_STREAM_EOF, KIND_NET_STREAM_OPEN, KIND_NET_STREAM_OPENED,
806:            KIND_NET_DIAL,
830:            KIND_NET_STREAM_OPEN,


42	    KIND_BRAIN_RESTARTED, KIND_ERROR, KIND_EXIT, KIND_INPUT, KIND_KILL, KIND_NET_DIAL,
43	    KIND_NET_DIALED, KIND_NET_PRESENCE_EVENT, KIND_NET_PRESENCE_SUBSCRIBE, KIND_NET_SENT,
44	    KIND_NET_STATUS, KIND_NET_STATUS_REPLY, KIND_NET_STREAMS, KIND_NET_STREAMS_REPLY,
45	    KIND_NET_STREAM_DATA, KIND_NET_STREAM_EOF, KIND_NET_STREAM_OPEN, KIND_NET_STREAM_OPENED,

    KIND_BRAIN_RESTARTED, KIND_ERROR, KIND_EXIT, KIND_INPUT, KIND_KILL, KIND_NET_DIAL,
    KIND_NET_DIALED, KIND_NET_PRESENCE_EVENT, KIND_NET_PRESENCE_SUBSCRIBE, KIND_NET_SENT,
    KIND_NET_STATUS, KIND_NET_STATUS_REPLY, KIND_NET_STREAMS, KIND_NET_STREAMS_REPLY,
    KIND_NET_STREAM_DATA, KIND_NET_STREAM_EOF, KIND_NET_STREAM_OPEN, KIND_NET_STREAM_OPENED,


    KIND_BRAIN_RESTARTED, KIND_ERROR, KIND_EXIT, KIND_INPUT, KIND_KILL, KIND_NET_DIAL,
    KIND_NET_DIALED, KIND_NET_PRESENCE_EVENT, KIND_NET_PRESENCE_SUBSCRIBE, KIND_NET_SENT,

    KIND_BRAIN_RESTARTED, KIND_ERROR, KIND_EXIT, KIND_INPUT, KIND_KILL, KIND_NET_DIAL,
    KIND_NET_DIALED, KIND_NET_DIAL_LOOPBACK, KIND_NET_PRESENCE_EVENT, KIND_NET_PRESENCE_SUBSCRIBE,
    KIND_NET_SENT,


The file C:\Users\decid\Documents\projects\spt-core\crates\spt-daemon\src\brain.rs has been updated successfully. (file state is current in your context — no need to Read it back)

    KIND_BRAIN_RESTARTED, KIND_ERROR, KIND_EXIT, KIND_INPUT, KIND_KILL, KIND_NET_DIAL,
    KIND_NET_DIALED, KIND_NET_PRESENCE_EVENT, KIND_NET_PRESENCE_SUBSCRIBE, KIND_NET_SENT,

    KIND_BRAIN_RESTARTED, KIND_ERROR, KIND_EXIT, KIND_INPUT, KIND_KILL, KIND_NET_DIAL,
    KIND_NET_DIALED, KIND_NET_DIAL_LOOPBACK, KIND_NET_PRESENCE_EVENT, KIND_NET_PRESENCE_SUBSCRIBE,
    KIND_NET_SENT,

NetStreamSubscribeReq, NetStreamsReply, OutputEvent, PairJoinReply, PairJoinReq, ResizeReq,

SessionsReply, SpawnReq, Spawned, SubscribeReq, KIND_APPLIED, KIND_BRAIN_RESTART,

-    KIND_NET_DIALED, KIND_NET_PRESENCE_EVENT, KIND_NET_PRESENCE_SUBSCRIBE, KIND_NET_SENT,

+    KIND_NET_DIALED, KIND_NET_DIAL_LOOPBACK, KIND_NET_PRESENCE_EVENT, KIND_NET_PRESENCE_SUBSCRIBE,

KIND_NET_STATUS, KIND_NET_STATUS_REPLY, KIND_NET_STREAMS, KIND_NET_STREAMS_REPLY,

KIND_NET_STREAM_DATA, KIND_NET_STREAM_EOF, KIND_NET_STREAM_OPEN, KIND_NET_STREAM_OPENED,

KIND_NET_STREAM_SEND, KIND_NET_STREAM_SUBSCRIBE, KIND_OUTPUT, KIND_PAIR_JOIN, KIND_PAIR_JOINED,


Now add `net_dial_loopback` method after `net_dial`:


        let deadline = self.call_deadline();
        loop {
            match self.read_event_until(deadline)? {
                BrokerEvent::NetDialed(d) => return Ok(d),
                BrokerEvent::Error { message } => return Err(io::Error::other(message)),
                _ => continue,
            }
        }
    }

    /// Open a bidi stream on a held connection (D4b).

        let deadline = self.call_deadline();
        loop {
            match self.read_event_until(deadline)? {
                BrokerEvent::NetDialed(d) => return Ok(d),
                BrokerEvent::Error { message } => return Err(io::Error::other(message)),
                _ => continue,
            }
        }
    }

    /// Mint (or reuse) the broker's single in-process loopback connection
    /// (M12 W1.5, B1) — the transport a LOCAL `spt rc` rides, because a QUIC
    /// self-dial is refused by iroh ("Connecting to ourself is not supported").
    /// The returned [`NetDialed::remote_id_hex`] is THIS node's own id, so a
    /// stream served over it gates same-node (access short-circuit Allow). No
    /// op id: the singleton is idempotent by reuse, and there is no network leg
    /// a crash-replay could double. Identical from `request_attach` up — the
    /// one-pump invariant lives at the transport leaf, not here.
    // [impl->REQ-RC-1]
    pub fn net_dial_loopback(&mut self) -> io::Result<NetDialed> {
        self.send(KIND_NET_DIAL_LOOPBACK, serde_json::Value::Null)?;
        let deadline = self.call_deadline();
        loop {
            match self.read_event_until(deadline)? {
                BrokerEvent::NetDialed(d) => return Ok(d),
                BrokerEvent::Error { message } => return Err(io::Error::other(message)),
                _ => continue,
            }
        }
    }

    /// Open a bidi stream on a held connection (D4b).


        let deadline = self.call_deadline();
        loop {
            match self.read_event_until(deadline)? {
                BrokerEvent::NetDialed(d) => return Ok(d),
                BrokerEvent::Error { message } => return Err(io::Error::other(message)),
                _ => continue,
            }
        }
    }

    /// Mint (or reuse) the broker's single in-process loopback connection
    /// (M12 W1.5, B1) — the transport a LOCAL `spt rc` rides, because a QUIC
    /// self-dial is refused by iroh ("Connecting to ourself is not supported").
    /// The returned [`NetDialed::remote_id_hex`] is THIS node's own id, so a
    /// stream served over it gates same-node (access short-circuit Allow). No
    /// op id: the singleton is idempotent by reuse, and there is no network leg
    /// a crash-replay could double. Identical from `request_attach` up — the
    /// one-pump invariant lives at the transport leaf, not here.
    // [impl->REQ-RC-1]
    pub fn net_dial_loopback(&mut self) -> io::Result<NetDialed> {
        self.send(KIND_NET_DIAL_LOOPBACK, serde_json::Value::Null)?;
        let deadline = self.call_deadline();
        loop {
            match self.read_event_until(deadline)? {
                BrokerEvent::NetDialed(d) => return Ok(d),
                BrokerEvent::Error { message } => return Err(io::Error::other(message)),
                _ => continue,
            }
        }
    }

    /// Open a bidi stream on a held connection (D4b).

+    /// Mint (or reuse) the broker's single in-process loopback connection

+    /// (M12 W1.5, B1) — the transport a LOCAL `spt rc` rides, because a QUIC

+    /// self-dial is refused by iroh ("Connecting to ourself is not supported").

+    /// The returned [`NetDialed::remote_id_hex`] is THIS node's own id, so a

+    /// stream served over it gates same-node (access short-circuit Allow). No

+    /// op id: the singleton is idempotent by reuse, and there is no network leg

+    /// a crash-replay could double. Identical from `request_attach` up — the

+    /// one-pump invariant lives at the transport leaf, not here.

+    pub fn net_dial_loopback(&mut self) -> io::Result<NetDialed> {

+        self.send(KIND_NET_DIAL_LOOPBACK, serde_json::Value::Null)?;

+        let deadline = self.call_deadline();

+            match self.read_event_until(deadline)? {

+                BrokerEvent::NetDialed(d) => return Ok(d),

+                BrokerEvent::Error { message } => return Err(io::Error::other(message)),

/// Open a bidi stream on a held connection (D4b). With `op_id` the open is

/// exactly-once (a replay is answered with the original stream). NOTE all

/// net op ids — dials, opens, sends — share ONE durable namespace; mint


Now broker.rs: import + dispatch arm + handler. Read dispatch region + imports:


52	    NetStreamsReply, PairJoinReply, PairJoinReq, ResizeReq, SessionInfo, SessionsReply, SpawnReq,
53	    Spawned, SubscribeReq, KIND_BRAIN_RESTART, KIND_BRAIN_RESTARTED, KIND_ERROR, KIND_EXIT,
54	    KIND_INPUT, KIND_KILL, KIND_NET_DIAL, KIND_NET_PRESENCE_SUBSCRIBE, KIND_NET_SENT,
55	    KIND_NET_STATUS, KIND_NET_STATUS_REPLY, KIND_NET_STREAMS, KIND_NET_STREAMS_REPLY,
56	    KIND_NET_STREAM_OPEN, KIND_NET_STREAM_OPENED, KIND_NET_STREAM_SEND, KIND_NET_STREAM_SUBSCRIBE,
57	    KIND_PAIR_JOIN, KIND_PAIR_JOINED, KIND_RESIZE, KIND_SESSIONS, KIND_SESSIONS_REPLY, KIND_SPAWN,
58	    KIND_SPAWNED, KIND_SUBSCRIBE,
59	};

    NetStreamsReply, PairJoinReply, PairJoinReq, ResizeReq, SessionInfo, SessionsReply, SpawnReq,
    Spawned, SubscribeReq, KIND_BRAIN_RESTART, KIND_BRAIN_RESTARTED, KIND_ERROR, KIND_EXIT,
    KIND_INPUT, KIND_KILL, KIND_NET_DIAL, KIND_NET_PRESENCE_SUBSCRIBE, KIND_NET_SENT,
    KIND_NET_STATUS, KIND_NET_STATUS_REPLY, KIND_NET_STREAMS, KIND_NET_STREAMS_REPLY,
    KIND_NET_STREAM_OPEN, KIND_NET_STREAM_OPENED, KIND_NET_STREAM_SEND, KIND_NET_STREAM_SUBSCRIBE,
    KIND_PAIR_JOIN, KIND_PAIR_JOINED, KIND_RESIZE, KIND_SESSIONS, KIND_SESSIONS_REPLY, KIND_SPAWN,
    KIND_SPAWNED, KIND_SUBSCRIBE,
};


KIND_INPUT, KIND_KILL, KIND_NET_DIAL, KIND_NET_PRESENCE_SUBSCRIBE, KIND_NET_SENT,

    KIND_INPUT, KIND_KILL, KIND_NET_DIAL, KIND_NET_DIAL_LOOPBACK, KIND_NET_PRESENCE_SUBSCRIBE,
    KIND_NET_SENT,


The file C:\Users\decid\Documents\projects\spt-core\crates\spt-daemon\src\broker.rs has been updated successfully. (file state is current in your context — no need to Read it back)

    KIND_INPUT, KIND_KILL, KIND_NET_DIAL, KIND_NET_DIAL_LOOPBACK, KIND_NET_PRESENCE_SUBSCRIBE,
    KIND_NET_SENT,

NetStatusReply, NetStreamOpenReq, NetStreamOpened, NetStreamSendReq, NetStreamSubscribeReq,

NetStreamsReply, PairJoinReply, PairJoinReq, ResizeReq, SessionInfo, SessionsReply, SpawnReq,

Spawned, SubscribeReq, KIND_BRAIN_RESTART, KIND_BRAIN_RESTARTED, KIND_ERROR, KIND_EXIT,

-    KIND_INPUT, KIND_KILL, KIND_NET_DIAL, KIND_NET_PRESENCE_SUBSCRIBE, KIND_NET_SENT,

+    KIND_INPUT, KIND_KILL, KIND_NET_DIAL, KIND_NET_DIAL_LOOPBACK, KIND_NET_PRESENCE_SUBSCRIBE,

KIND_NET_STATUS, KIND_NET_STATUS_REPLY, KIND_NET_STREAMS, KIND_NET_STREAMS_REPLY,

KIND_NET_STREAM_OPEN, KIND_NET_STREAM_OPENED, KIND_NET_STREAM_SEND, KIND_NET_STREAM_SUBSCRIBE,

KIND_PAIR_JOIN, KIND_PAIR_JOINED, KIND_RESIZE, KIND_SESSIONS, KIND_SESSIONS_REPLY, KIND_SPAWN,


435	                KIND_NET_STATUS => self.dispatch_net_status(&send),
436	                KIND_NET_DIAL => {
437	                    if let Err(msg) = self.dispatch_net_dial(env, &send) {
438	                        send_error(&send, &msg);
439	                    }
440	                }
441	                KIND_PAIR_JOIN => {
442	                    if let Err(msg) = self.dispatch_pair_join(env, &send) {
443	                        send_error(&send, &msg);
444	                    }
445	                }
446	                KIND_NET_STREAM_OPEN => {
447	                    if let Err(msg) = self.dispatch_net_stream_open(env, &send) {
448	                        send_error(&send, &msg);
449	                    }
450	                }

                KIND_NET_STATUS => self.dispatch_net_status(&send),
                KIND_NET_DIAL => {
                    if let Err(msg) = self.dispatch_net_dial(env, &send) {
                        send_error(&send, &msg);
                    }
                }
                KIND_PAIR_JOIN => {
                    if let Err(msg) = self.dispatch_pair_join(env, &send) {
                        send_error(&send, &msg);
                    }
                }
                KIND_NET_STREAM_OPEN => {
                    if let Err(msg) = self.dispatch_net_stream_open(env, &send) {
                        send_error(&send, &msg);
                    }
                }


                KIND_NET_DIAL => {
                    if let Err(msg) = self.dispatch_net_dial(env, &send) {
                        send_error(&send, &msg);
                    }
                }

                KIND_NET_DIAL => {
                    if let Err(msg) = self.dispatch_net_dial(env, &send) {
                        send_error(&send, &msg);
                    }
                }
                KIND_NET_DIAL_LOOPBACK => {
                    if let Err(msg) = self.dispatch_net_dial_loopback(&send) {
                        send_error(&send, &msg);
                    }
                }


                KIND_NET_DIAL => {
                    if let Err(msg) = self.dispatch_net_dial(env, &send) {
                        send_error(&send, &msg);
                    }
                }
                KIND_NET_DIAL_LOOPBACK => {
                    if let Err(msg) = self.dispatch_net_dial_loopback(&send) {
                        send_error(&send, &msg);
                    }
                }

+                KIND_NET_DIAL_LOOPBACK => {

+                    if let Err(msg) = self.dispatch_net_dial_loopback(&send) {

+                        send_error(&send, &msg);

if let Err(msg) = self.dispatch_pair_join(env, &send) {


Now add the `dispatch_net_dial_loopback` handler after `dispatch_net_dial`:


                send_frame(
                    send,
                    &net_dialed_envelope(conn_id, remote, Some(op), applied_now, observed),
                );
                Ok(())
            }
        }
    }

                send_frame(
                    send,
                    &net_dialed_envelope(conn_id, remote, Some(op), applied_now, observed),
                );
                Ok(())
            }
        }
    }

    /// Mint (or reuse) the broker's single in-process loopback connection
    /// (M12 W1.5, B1) and answer with `net-dialed`. The transport a LOCAL
    /// `spt rc` rides — QUIC self-dial is refused by iroh, so local attach
    /// uses a broker-minted loopback conn whose `remote_id_hex` is this node's
    /// own id (the served stream then gates same-node, access short-circuit
    /// Allow). Not journaled: the singleton is idempotent by reuse, and there
    /// is no network leg a crash-replay could double.
    // [impl->REQ-RC-1]
    fn dispatch_net_dial_loopback(&self, send: &SharedSend) -> Result<(), String> {
        let host = self
            .net
            .get()
            .ok_or("net disabled: this broker was bound without a network host")?;
        let (conn_id, remote) = host.dial_loopback();
        send_frame(
            send,
            &net_dialed_envelope(conn_id, remote, None, true, serde_json::Value::Null),
        );
        Ok(())
    }


                send_frame(
                    send,
                    &net_dialed_envelope(conn_id, remote, Some(op), applied_now, observed),
                );
                Ok(())
            }
        }
    }

    /// Mint (or reuse) the broker's single in-process loopback connection
    /// (M12 W1.5, B1) and answer with `net-dialed`. The transport a LOCAL
    /// `spt rc` rides — QUIC self-dial is refused by iroh, so local attach
    /// uses a broker-minted loopback conn whose `remote_id_hex` is this node's
    /// own id (the served stream then gates same-node, access short-circuit
    /// Allow). Not journaled: the singleton is idempotent by reuse, and there
    /// is no network leg a crash-replay could double.
    // [impl->REQ-RC-1]
    fn dispatch_net_dial_loopback(&self, send: &SharedSend) -> Result<(), String> {
        let host = self
            .net
            .get()
            .ok_or("net disabled: this broker was bound without a network host")?;
        let (conn_id, remote) = host.dial_loopback();
        send_frame(
            send,
            &net_dialed_envelope(conn_id, remote, None, true, serde_json::Value::Null),
        );
        Ok(())
    }

+    /// Mint (or reuse) the broker's single in-process loopback connection

+    /// (M12 W1.5, B1) and answer with `net-dialed`. The transport a LOCAL

+    /// `spt rc` rides — QUIC self-dial is refused by iroh, so local attach

+    /// uses a broker-minted loopback conn whose `remote_id_hex` is this node's

+    /// own id (the served stream then gates same-node, access short-circuit

+    /// Allow). Not journaled: the singleton is idempotent by reuse, and there

+    /// is no network leg a crash-replay could double.

+    fn dispatch_net_dial_loopback(&self, send: &SharedSend) -> Result<(), String> {

+            .ok_or("net disabled: this broker was bound without a network host")?;

+        let (conn_id, remote) = host.dial_loopback();

+            &net_dialed_envelope(conn_id, remote, None, true, serde_json::Value::Null),

/// Run the joiner leg of the subnet pairing ceremony (M7 D3,

/// REQ-SUBNET-2) on the broker-owned endpoint — it binds and pins the

/// REAL node pubkey, so it cannot run anywhere else. Not journaled: a


Now T1.5.3: swap rc.rs self-dial → loopback dial:


    let ops = OpMinter::new();
    // Transport: dial our OWN node (loopback peer) so the inbound stream is
    // served by the broker's production attach dispatch — local = the degenerate
    // cross-node case. (If same-node self-dial misbehaves, the fallback is a
    // broker-local stream that surfaces as the same net-stream events; the pump
    // below is unchanged either way — the one-path invariant is here, not above.)
    let addr = brain.net_status().map_err(|e| format!("net status: {e}"))?.addr;
    let dialed = brain
        .net_dial(addr, Some(ops.next()))
        .map_err(|e| format!("loopback dial: {e}"))?;
    let stream_id = request_attach(&mut brain, dialed.conn_id, session_id, 0, ops.next())

    let ops = OpMinter::new();
    // Transport: a broker-minted in-process LOOPBACK connection (M12 W1.5, B1).
    // A QUIC self-dial is refused by iroh ("Connecting to ourself is not
    // supported"), so local attach cannot ride a self-dialed conn; instead the
    // broker wires an in-process loopback conn whose streams surface as the SAME
    // net-stream events the cross-node QUIC path produces. From `request_attach`
    // down this is byte-identical to a cross-node attach — the one-pump invariant
    // lives at the transport leaf inside the broker, never here. The loopback
    // peer's origin is this node's own id, so the target's serve gates same-node.
    let dialed = brain
        .net_dial_loopback()
        .map_err(|e| format!("loopback dial: {e}"))?;
    let stream_id = request_attach(&mut brain, dialed.conn_id, session_id, 0, ops.next())


The file C:\Users\decid\Documents\projects\spt-core\crates\spt\src\rc.rs has been updated successfully. (file state is current in your context — no need to Read it back)

    let ops = OpMinter::new();
    // Transport: dial our OWN node (loopback peer) so the inbound stream is
    // served by the broker's production attach dispatch — local = the degenerate
    // cross-node case. (If same-node self-dial misbehaves, the fallback is a
    // broker-local stream that surfaces as the same net-stream events; the pump
    // below is unchanged either way — the one-path invariant is here, not above.)
    let addr = brain.net_status().map_err(|e| format!("net status: {e}"))?.addr;
    let dialed = brain
        .net_dial(addr, Some(ops.next()))
        .map_err(|e| format!("loopback dial: {e}"))?;
    let stream_id = request_attach(&mut brain, dialed.conn_id, session_id, 0, ops.next())

    let ops = OpMinter::new();
    // Transport: a broker-minted in-process LOOPBACK connection (M12 W1.5, B1).
    // A QUIC self-dial is refused by iroh ("Connecting to ourself is not
    // supported"), so local attach cannot ride a self-dialed conn; instead the
    // broker wires an in-process loopback conn whose streams surface as the SAME
    // net-stream events the cross-node QUIC path produces. From `request_attach`
    // down this is byte-identical to a cross-node attach — the one-pump invariant
    // lives at the transport leaf inside the broker, never here. The loopback
    // peer's origin is this node's own id, so the target's serve gates same-node.
    let dialed = brain
        .net_dial_loopback()
        .map_err(|e| format!("loopback dial: {e}"))?;
    let stream_id = request_attach(&mut brain, dialed.conn_id, session_id, 0, ops.next())

.ok_or_else(|| format!("no live session for endpoint '{endpoint_id}'"))?;

-    // Transport: dial our OWN node (loopback peer) so the inbound stream is

-    // served by the broker's production attach dispatch — local = the degenerate

-    // cross-node case. (If same-node self-dial misbehaves, the fallback is a

-    // broker-local stream that surfaces as the same net-stream events; the pump

-    // below is unchanged either way — the one-path invariant is here, not above.)

-    let addr = brain.net_status().map_err(|e| format!("net status: {e}"))?.addr;

+    // Transport: a broker-minted in-process LOOPBACK connection (M12 W1.5, B1).

+    // A QUIC self-dial is refused by iroh ("Connecting to ourself is not

+    // supported"), so local attach cannot ride a self-dialed conn; instead the

+    // broker wires an in-process loopback conn whose streams surface as the SAME

+    // net-stream events the cross-node QUIC path produces. From `request_attach`

+    // down this is byte-identical to a cross-node attach — the one-pump invariant

+    // lives at the transport leaf inside the broker, never here. The loopback

+    // peer's origin is this node's own id, so the target's serve gates same-node.

-        .net_dial(addr, Some(ops.next()))

.map_err(|e| format!("attach request: {e}"))?;


Check rc.rs for now-unused `net_status`:


No matches found


rc.rs clean. Now compile-check spt-daemon + spt before writing tests.


Bash

cargo check -p spt-daemon -p spt 2>&1 | tail -50

cargo check spt-daemon + spt


Command running in background with ID: bn0k38p1n. Output is being written to: C:\Users\decid\AppData\Local\Temp\claude\C--Users-decid-Documents-projects-spt-core\c570fe63-c413-4a17-bb14-ee75e02a53bd\tasks\bn0k38p1n.output. You will be notified when it completes. To check interim output, use Read on that file path.


<task-notification>
<task-id>bn0k38p1n</task-id>
<tool-use-id>toolu_011aXpY28FdCRsfT5CcqmDaR</tool-use-id>
<output-file>C:\Users\decid\AppData\Local\Temp\claude\C--Users-decid-Documents-projects-spt-core\c570fe63-c413-4a17-bb14-ee75e02a53bd\tasks\bn0k38p1n.output</output-file>
<status>completed</status>
<summary>Background command "cargo check spt-daemon + spt" completed (exit code 0)</summary>
</task-notification>


Build running. While it compiles, write the int test (T1.5.4): shared helper + local test, and refactor a cross-node test to call the helper (makes one-pump literal). First check build status.


1	    Checking spt-daemon v0.6.0 (C:\Users\decid\Documents\projects\spt-core\crates\spt-daemon)
2	error[E0599]: no method named `map_err` found for opaque type `impl Future<Output = Result<(), std::io::Error>>` in the current scope
3	   --> crates\spt-daemon\src\nethost.rs:956:31
4	    |
5	956 |                 send.finish().map_err(|e| io::Error::other(e.to_string()))?;
6	    |                               ^^^^^^^ method not found in `impl Future<Output = Result<(), std::io::Error>>`
7	    |
8	   ::: C:\Users\decid\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\futures-util-0.3.32\src\future\try_future\mod.rs:308:8
9	    |
10	308 |     fn map_err<E, F>(self, f: F) -> MapErr<Self, F>
11	    |        ------- the method is available for `impl Future<Output = Result<(), std::io::Error>>` here
12	    |
13	    = help: items from traits can only be used if the trait is in scope
14	help: consider `await`ing on the `Future` and calling the method on its `Output`
15	    |
16	956 |                 send.finish().await.map_err(|e| io::Error::other(e.to_string()))?;
17	    |                               ++++++
18	help: trait `TryFutureExt` which provides `map_err` is implemented but not in scope; perhaps you want to import it
19	    |
20	 29 + use futures_util::future::try_future::TryFutureExt;
21	    |
22
23	error[E0282]: type annotations needed
24	   --> crates\spt-daemon\src\nethost.rs:956:40
25	    |
26	956 |                 send.finish().map_err(|e| io::Error::other(e.to_string()))?;
27	    |                                        ^                   - type must be known at this point
28	    |
29	help: consider giving this closure parameter an explicit type
30	    |
31	956 |                 send.finish().map_err(|e: /* Type */| io::Error::other(e.to_string()))?;
32	    |                                         ++++++++++++
33
34	Some errors have detailed explanations: E0282, E0599.
35	For more information about an error, try `rustc --explain E0282`.
36	error: could not compile `spt-daemon` (lib) due to 2 previous errors
37

    Checking spt-daemon v0.6.0 (C:\Users\decid\Documents\projects\spt-core\crates\spt-daemon)
error[E0599]: no method named `map_err` found for opaque type `impl Future<Output = Result<(), std::io::Error>>` in the current scope
   --> crates\spt-daemon\src\nethost.rs:956:31
    |
956 |                 send.finish().map_err(|e| io::Error::other(e.to_string()))?;
    |                               ^^^^^^^ method not found in `impl Future<Output = Result<(), std::io::Error>>`
    |
   ::: C:\Users\decid\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\futures-util-0.3.32\src\future\try_future\mod.rs:308:8
    |
308 |     fn map_err<E, F>(self, f: F) -> MapErr<Self, F>
    |        ------- the method is available for `impl Future<Output = Result<(), std::io::Error>>` here
    |
    = help: items from traits can only be used if the trait is in scope
help: consider `await`ing on the `Future` and calling the method on its `Output`
    |
956 |                 send.finish().await.map_err(|e| io::Error::other(e.to_string()))?;
    |                               ++++++
help: trait `TryFutureExt` which provides `map_err` is implemented but not in scope; perhaps you want to import it
    |
 29 + use futures_util::future::try_future::TryFutureExt;
    |

error[E0282]: type annotations needed
   --> crates\spt-daemon\src\nethost.rs:956:40
    |
956 |                 send.finish().map_err(|e| io::Error::other(e.to_string()))?;
    |                                        ^                   - type must be known at this point
    |
help: consider giving this closure parameter an explicit type
    |
956 |                 send.finish().map_err(|e: /* Type */| io::Error::other(e.to_string()))?;
    |                                         ++++++++++++

Some errors have detailed explanations: E0282, E0599.
For more information about an error, try `rustc --explain E0282`.
error: could not compile `spt-daemon` (lib) due to 2 previous errors


Prompt:
<task-notification>
<task-id>bn0k38p1n</task-id>
<tool-use-id>toolu_011aXpY28FdCRsfT5CcqmDaR</tool-use-id>
<output-file>C:\Users\decid\AppData\Local\Temp\claude\C--Users-decid-Documents-projects-spt-core\c570fe63-c413-4a17-bb14-ee75e02a53bd\tasks\bn0k38p1n.output</output-file>
<status>completed</status>
<summary>Background command "cargo check spt-daemon + spt" completed (exit code 0)</summary>
</task-notification>


`send_stream`'s `finish()` now hits my async `SendHalf::finish` — needs `.await`. Fix:


944	                )
945	            })?)
946	        };
947	        let bytes = bytes.to_vec();
948	        self.runtime.handle().block_on(async move {
949	            let mut send = entry.send.lock().await;
950	            if !bytes.is_empty() {
951	                send.write_all(&bytes)
952	                    .await
953	                    .map_err(|e| io::Error::other(e.to_string()))?;
954	            }
955	            if finish {
956	                send.finish().map_err(|e| io::Error::other(e.to_string()))?;
957	            }
958	            Ok(())
959	        })
960	    }
961
962	    /// Every held stream's info — the query a re-attaching brain uses to find
963	    /// streams (including peer-initiated ones that arrived while it was down).
964	    pub fn stream_infos(&self) -> Vec<NetStreamInfo> {
965	        let streams = self.shared.streams.lock().unwrap();

                )
            })?)
        };
        let bytes = bytes.to_vec();
        self.runtime.handle().block_on(async move {
            let mut send = entry.send.lock().await;
            if !bytes.is_empty() {
                send.write_all(&bytes)
                    .await
                    .map_err(|e| io::Error::other(e.to_string()))?;
            }
            if finish {
                send.finish().map_err(|e| io::Error::other(e.to_string()))?;
            }
            Ok(())
        })
    }

    /// Every held stream's info — the query a re-attaching brain uses to find
    /// streams (including peer-initiated ones that arrived while it was down).
    pub fn stream_infos(&self) -> Vec<NetStreamInfo> {
        let streams = self.shared.streams.lock().unwrap();


Edit

            let mut send = entry.send.lock().await;
            if !bytes.is_empty() {
                send.write_all(&bytes)
                    .await
                    .map_err(|e| io::Error::other(e.to_string()))?;
            }
            if finish {
                send.finish().map_err(|e| io::Error::other(e.to_string()))?;
            }
            Ok(())

            let mut send = entry.send.lock().await;
            if !bytes.is_empty() {
                send.write_all(&bytes).await?;
            }
            if finish {
                send.finish().await?;
            }
            Ok(())


The file C:\Users\decid\Documents\projects\spt-core\crates\spt-daemon\src\nethost.rs has been updated successfully. (file state is current in your context — no need to Read it back)

            let mut send = entry.send.lock().await;
            if !bytes.is_empty() {
                send.write_all(&bytes)
                    .await
                    .map_err(|e| io::Error::other(e.to_string()))?;
            }
            if finish {
                send.finish().map_err(|e| io::Error::other(e.to_string()))?;
            }
            Ok(())

            let mut send = entry.send.lock().await;
            if !bytes.is_empty() {
                send.write_all(&bytes).await?;
            }
            if finish {
                send.finish().await?;
            }
            Ok(())

-                    .map_err(|e| io::Error::other(e.to_string()))?;

+                send.write_all(&bytes).await?;

-                send.finish().map_err(|e| io::Error::other(e.to_string()))?;


Re-run cargo check:


Bash

cargo check -p spt-daemon -p spt 2>&1 | tail -40

cargo check after finish fix


Command running in background with ID: b32ef21z0. Output is being written to: C:\Users\decid\AppData\Local\Temp\claude\C--Users-decid-Documents-projects-spt-core\c570fe63-c413-4a17-bb14-ee75e02a53bd\tasks\b32ef21z0.output. You will be notified when it completes. To check interim output, use Read on that file path.


<task-notification>
<task-id>b32ef21z0</task-id>
<tool-use-id>toolu_01H4VL4ZdajeUpaabjCtwFmS</tool-use-id>
<output-file>C:\Users\decid\AppData\Local\Temp\claude\C--Users-decid-Documents-projects-spt-core\c570fe63-c413-4a17-bb14-ee75e02a53bd\tasks\b32ef21z0.output</output-file>
<status>completed</status>
<summary>Background command "cargo check after finish fix" completed (exit code 0)</summary>
</task-notification>


Build running. Write the test. First update `wait_for_stream` to filter peer rows (single-broker loopback has both operator+peer rows in the table):


Edit

/// Poll the brain's `net-streams` until a stream appears; return
/// `(stream_id, remote_id_hex)`.
fn wait_for_stream(brain: &mut Brain) -> (u64, String) {
    for _ in 0..400 {
        let reply = brain.net_streams().expect("net-streams");
        if let Some(s) = reply.streams.first() {
            return (s.stream_id, s.remote_id_hex.clone());
        }
        thread::sleep(Duration::from_millis(5));
    }
    panic!("attach stream never appeared at the target's broker");
}

/// Poll the brain's `net-streams` until a PEER-initiated stream appears; return
/// `(stream_id, remote_id_hex)`. Filtering on `!initiated_locally` is what the
/// production dispatch loop does (dispatch.rs) — and it is REQUIRED for the
/// single-broker loopback case, where the table holds BOTH the operator's own
/// row and the cross-wired peer row: the serve target is always the peer row.
fn wait_for_stream(brain: &mut Brain) -> (u64, String) {
    for _ in 0..400 {
        let reply = brain.net_streams().expect("net-streams");
        if let Some(s) = reply.streams.iter().find(|s| !s.initiated_locally) {
            return (s.stream_id, s.remote_id_hex.clone());
        }
        thread::sleep(Duration::from_millis(5));
    }
    panic!("attach stream never appeared at the target's broker");
}

/// The operator+serve drive shared by EVERY attach transport — the M12 W1.5
/// one-pump invariant made STRUCTURAL: cross-node (QUIC conn) and local
/// (broker loopback conn) call this identically; they diverge ONLY in how
/// `conn_id` was acquired (`net_dial` vs `net_dial_loopback`) and in
/// `expected_origin`, never in the `serve_attach`+render pump below. There is no
/// second code path that could drift.
///
/// Given an acquired `conn_id` on `operator` and the `target` broker connection
/// holding `session_id` for `endpoint`: open the attach stream, serve it on
/// `target` under `expected_origin` (asserted == the stream table's proven
/// origin), drive `marker` through the PTY and render it back over the wire,
/// then detach and confirm the serve loop ended `Detached` (session outlives).
/// Returns the rendered viewport bytes + the (still-live) target brain so the
/// caller can assert session survival and clean up.
fn attach_drive_detach(
    operator: &mut Brain,
    mut target: Brain,
    conn_id: u64,
    session_id: u64,
    endpoint: &str,
    expected_origin: &str,
    marker: &[u8],
) -> (Vec<u8>, Brain) {
    let stream_b = request_attach(operator, conn_id, session_id, 0, 2).expect("request");
    operator
        .net_stream_subscribe(stream_b, 0)
        .expect("operator subscribe");

    // The target serves the inbound attach stream under the proven origin
    // (KH 7.5 — the stream table, never payload). Cross-node: the handshake id.
    // Loopback: this node's own id (broker-minted), which gates same-node.
    let (stream_a, origin) = wait_for_stream(&mut target);
    assert_eq!(
        origin, expected_origin,
        "serve gate subject IS the stream table's proven origin"
    );
    let endpoint_owned = endpoint.to_string();
    let server = thread::spawn(move || {
        let outcome =
            serve_attach(&mut target, stream_a, &endpoint_owned, &origin, 0).expect("serve");
        (outcome, target)
    });

    // Drive the marker through; the echo streams back over the SAME pump.
    let mut keys = marker.to_vec();
    keys.push(b'\r');
    send_attach_input(operator, stream_b, &keys, 1).expect("input");
    let mut decoder = AttachDecoder::new();
    let (mut cursor, mut viewport) = (0u64, Vec::new());
    render_until(
        operator,
        stream_b,
        &mut decoder,
        &mut cursor,
        &mut viewport,
        marker,
    );

    // Detach: the viewport ends with the session still running.
    operator
        .net_stream_send(stream_b, &[], None, true)
        .expect("detach");
    let (outcome, target) = server.join().expect("serve thread");
    assert_eq!(outcome, AttachServeOutcome::Detached);
    (viewport, target)
}


The file C:\Users\decid\Documents\projects\spt-core\crates\spt-daemon\tests\attach.rs has been updated successfully. (file state is current in your context — no need to Read it back)

/// Poll the brain's `net-streams` until a stream appears; return
/// `(stream_id, remote_id_hex)`.
fn wait_for_stream(brain: &mut Brain) -> (u64, String) {
    for _ in 0..400 {
        let reply = brain.net_streams().expect("net-streams");
        if let Some(s) = reply.streams.first() {
            return (s.stream_id, s.remote_id_hex.clone());
        }
        thread::sleep(Duration::from_millis(5));
    }
    panic!("attach stream never appeared at the target's broker");
}

/// Poll the brain's `net-streams` until a PEER-initiated stream appears; return
/// `(stream_id, remote_id_hex)`. Filtering on `!initiated_locally` is what the
/// production dispatch loop does (dispatch.rs) — and it is REQUIRED for the
/// single-broker loopback case, where the table holds BOTH the operator's own
/// row and the cross-wired peer row: the serve target is always the peer row.
fn wait_for_stream(brain: &mut Brain) -> (u64, String) {
    for _ in 0..400 {
        let reply = brain.net_streams().expect("net-streams");
        if let Some(s) = reply.streams.iter().find(|s| !s.initiated_locally) {
            return (s.stream_id, s.remote_id_hex.clone());
        }
        thread::sleep(Duration::from_millis(5));
    }
    panic!("attach stream never appeared at the target's broker");
}

/// The operator+serve drive shared by EVERY attach transport — the M12 W1.5
/// one-pump invariant made STRUCTURAL: cross-node (QUIC conn) and local
/// (broker loopback conn) call this identically; they diverge ONLY in how
/// `conn_id` was acquired (`net_dial` vs `net_dial_loopback`) and in
/// `expected_origin`, never in the `serve_attach`+render pump below. There is no
/// second code path that could drift.
///
/// Given an acquired `conn_id` on `operator` and the `target` broker connection
/// holding `session_id` for `endpoint`: open the attach stream, serve it on
/// `target` under `expected_origin` (asserted == the stream table's proven
/// origin), drive `marker` through the PTY and render it back over the wire,
/// then detach and confirm the serve loop ended `Detached` (session outlives).
/// Returns the rendered viewport bytes + the (still-live) target brain so the
/// caller can assert session survival and clean up.
fn attach_drive_detach(
    operator: &mut Brain,
    mut target: Brain,
    conn_id: u64,
    session_id: u64,
    endpoint: &str,
    expected_origin: &str,
    marker: &[u8],
) -> (Vec<u8>, Brain) {
    let stream_b = request_attach(operator, conn_id, session_id, 0, 2).expect("request");
    operator
        .net_stream_subscribe(stream_b, 0)
        .expect("operator subscribe");

    // The target serves the inbound attach stream under the proven origin
    // (KH 7.5 — the stream table, never payload). Cross-node: the handshake id.
    // Loopback: this node's own id (broker-minted), which gates same-node.
    let (stream_a, origin) = wait_for_stream(&mut target);
    assert_eq!(
        origin, expected_origin,
        "serve gate subject IS the stream table's proven origin"
    );
    let endpoint_owned = endpoint.to_string();
    let server = thread::spawn(move || {
        let outcome =
            serve_attach(&mut target, stream_a, &endpoint_owned, &origin, 0).expect("serve");
        (outcome, target)
    });

    // Drive the marker through; the echo streams back over the SAME pump.
    let mut keys = marker.to_vec();
    keys.push(b'\r');
    send_attach_input(operator, stream_b, &keys, 1).expect("input");
    let mut decoder = AttachDecoder::new();
    let (mut cursor, mut viewport) = (0u64, Vec::new());
    render_until(
        operator,
        stream_b,
        &mut decoder,
        &mut cursor,
        &mut viewport,
        marker,
    );

    // Detach: the viewport ends with the session still running.
    operator
        .net_stream_send(stream_b, &[], None, true)
        .expect("detach");
    let (outcome, target) = server.join().expect("serve thread");
    assert_eq!(outcome, AttachServeOutcome::Detached);
    (viewport, target)
}

-/// Poll the brain's `net-streams` until a stream appears; return

+/// Poll the brain's `net-streams` until a PEER-initiated stream appears; return

+/// `(stream_id, remote_id_hex)`. Filtering on `!initiated_locally` is what the

+/// production dispatch loop does (dispatch.rs) — and it is REQUIRED for the

+/// single-broker loopback case, where the table holds BOTH the operator's own

+/// row and the cross-wired peer row: the serve target is always the peer row.

-        if let Some(s) = reply.streams.first() {

+        if let Some(s) = reply.streams.iter().find(|s| !s.initiated_locally) {

+/// The operator+serve drive shared by EVERY attach transport — the M12 W1.5

+/// one-pump invariant made STRUCTURAL: cross-node (QUIC conn) and local

+/// (broker loopback conn) call this identically; they diverge ONLY in how

+/// `conn_id` was acquired (`net_dial` vs `net_dial_loopback`) and in

+/// `expected_origin`, never in the `serve_attach`+render pump below. There is no

+/// Given an acquired `conn_id` on `operator` and the `target` broker connection

+/// holding `session_id` for `endpoint`: open the attach stream, serve it on

+/// `target` under `expected_origin` (asserted == the stream table's proven

+/// origin), drive `marker` through the PTY and render it back over the wire,

+/// then detach and confirm the serve loop ended `Detached` (session outlives).

+/// Returns the rendered viewport bytes + the (still-live) target brain so the

+/// caller can assert session survival and clean up.

+    let stream_b = request_attach(operator, conn_id, session_id, 0, 2).expect("request");

+        .net_stream_subscribe(stream_b, 0)

+    // The target serves the inbound attach stream under the proven origin

+    // (KH 7.5 — the stream table, never payload). Cross-node: the handshake id.

+    // Loopback: this node's own id (broker-minted), which gates same-node.

+    let (stream_a, origin) = wait_for_stream(&mut target);

+        "serve gate subject IS the stream table's proven origin"

+    let endpoint_owned = endpoint.to_string();

+    let server = thread::spawn(move || {

+            serve_attach(&mut target, stream_a, &endpoint_owned, &origin, 0).expect("serve");

+    // Drive the marker through; the echo streams back over the SAME pump.

+    send_attach_input(operator, stream_b, &keys, 1).expect("input");

+    let mut decoder = AttachDecoder::new();

+    let (mut cursor, mut viewport) = (0u64, Vec::new());

+    // Detach: the viewport ends with the session still running.

+        .net_stream_send(stream_b, &[], None, true)

+    let (outcome, target) = server.join().expect("serve thread");

+    assert_eq!(outcome, AttachServeOutcome::Detached);

/// Operator-side viewport: consume attach-stream records, dedup `Output` by

/// seq, append rendered bytes to `buf`, until `needle` is rendered. Returns

/// the rendered-through cursor (last accepted seq + 1).


Prompt:
<task-notification>
<task-id>b32ef21z0</task-id>
<tool-use-id>toolu_01H4VL4ZdajeUpaabjCtwFmS</tool-use-id>
<output-file>C:\Users\decid\AppData\Local\Temp\claude\C--Users-decid-Documents-projects-spt-core\c570fe63-c413-4a17-bb14-ee75e02a53bd\tasks\b32ef21z0.output</output-file>
<status>completed</status>
<summary>Background command "cargo check after finish fix" completed (exit code 0)</summary>
</task-notification>


1	    Checking spt-daemon v0.6.0 (C:\Users\decid\Documents\projects\spt-core\crates\spt-daemon)
2	    Checking spt v0.6.0 (C:\Users\decid\Documents\projects\spt-core\crates\spt)
3	    Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.37s
4

    Checking spt-daemon v0.6.0 (C:\Users\decid\Documents\projects\spt-core\crates\spt-daemon)
    Checking spt v0.6.0 (C:\Users\decid\Documents\projects\spt-core\crates\spt)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.37s


Lib+bin compile clean. Now refactor the cross-node test to call the shared helper + add the local test. Refactor `remote_attach_drives_a_real_pty_cross_daemon`:


    // Operator B: dial A, open the attach stream, request the session.
    let mut operator = connect_retry(&name_b);
    let b_node = operator
        .net_status()
        .expect("b status")
        .node_id_hex
        .expect("node id");
    let conn = operator.net_dial(a_addr, Some(1)).expect("dial");
    let stream_b = request_attach(&mut operator, conn.conn_id, sid, 0, 2).expect("request");
    operator
        .net_stream_subscribe(stream_b, 0)
        .expect("operator subscribe");

    // Target A: the attach stream arrives; serve it on its own thread under
    // the handshake-proven origin (KH 7.5 — the stream table, not payload).
    let (stream_a, origin) = wait_for_stream(&mut target);
    assert_eq!(
        origin, b_node,
        "serve gate subject IS the QUIC handshake identity"
    );
    let server = thread::spawn(move || {
        let outcome = serve_attach(&mut target, stream_a, "ling", &origin, 0).expect("serve");
        (outcome, target)
    });

    // B types a marker; A's child echoes it; B renders it from the wire.
    send_attach_input(&mut operator, stream_b, b"REMOTE_DRIVE_OK\r", 1).expect("input");
    let mut decoder = AttachDecoder::new();
    let (mut cursor, mut viewport) = (0u64, Vec::new());
    render_until(
        &mut operator,
        stream_b,
        &mut decoder,
        &mut cursor,
        &mut viewport,
        b"REMOTE_DRIVE_OK",
    );

    // Detach: B finishes its send side; the serve loop ends with the session
    // still alive on A (viewport over, compute stays remote).
    operator
        .net_stream_send(stream_b, &[], None, true)
        .expect("detach");
    let (outcome, mut target) = server.join().expect("serve thread");
    assert_eq!(outcome, AttachServeOutcome::Detached);
    assert_eq!(
        broker_a.session_count(),
        1,
        "the session outlives the viewport"
    );
    target.kill_session().expect("cleanup kill");
}

    // Operator B: dial A (CROSS-NODE QUIC conn), then drive + detach over the
    // SHARED attach pump. The serve gate sees the QUIC handshake identity.
    let mut operator = connect_retry(&name_b);
    let b_node = operator
        .net_status()
        .expect("b status")
        .node_id_hex
        .expect("node id");
    let conn = operator.net_dial(a_addr, Some(1)).expect("dial");
    let (_viewport, mut target) = attach_drive_detach(
        &mut operator,
        target,
        conn.conn_id,
        sid,
        "ling",
        &b_node,
        b"REMOTE_DRIVE_OK",
    );
    assert_eq!(
        broker_a.session_count(),
        1,
        "the session outlives the viewport"
    );
    target.kill_session().expect("cleanup kill");
}

// [int->REQ-RC-1] LOCAL attach rides the byte-identical pump (M12 W1.5, B1):
// a single broker spawns a real PTY session; the operator acquires a
// broker-minted in-process LOOPBACK conn (`net_dial_loopback` — NOT a QUIC
// self-dial, which iroh refuses) and drives the PTY through the SAME
// `serve_attach`+render pump a cross-node operator uses. The proof that "both
// transports → one pump" is BY CONSTRUCTION: this test and the cross-node
// `remote_attach_drives_a_real_pty_cross_daemon` call the identical
// `attach_drive_detach` helper; they differ only in how `conn_id` is acquired
// (`net_dial_loopback` vs `net_dial`) and in the expected origin. The loopback
// origin is THIS node's own id, gating same-node (access short-circuit Allow in
// production; default-open in this hermetic home — both Allow). The session
// outlives the viewport.
#[test]
fn local_attach_via_loopback_conn_rides_the_same_pump() {
    init_home();
    let dir = tempfile::tempdir().expect("tempdir");
    let name = unique_name();
    let broker = net_broker(&name, &dir.path().join("solo"));

    // One broker plays BOTH target and operator (the local case). Spawn the
    // echo child, then attach to it over a loopback conn from a second brain
    // connection to the SAME broker.
    let mut target = connect_retry(&name);
    let sid = target
        .spawn_session(echo_spawn_req())
        .expect("spawn echo child");
    // The loopback peer's origin is this node's OWN broker-minted id — the same
    // value `net_dial_loopback` returns as `remote_id_hex`.
    let own_origin = target
        .net_dial_loopback()
        .expect("loopback dial (target side, for the origin)")
        .remote_id_hex;

    let mut operator = connect_retry(&name);
    let dialed = operator.net_dial_loopback().expect("operator loopback dial");
    assert_eq!(
        dialed.remote_id_hex, own_origin,
        "the loopback conn is the broker singleton — same own-node origin"
    );
    let (_viewport, mut target) = attach_drive_detach(
        &mut operator,
        target,
        dialed.conn_id,
        sid,
        "ling",
        &own_origin,
        b"LOCAL_DRIVE_OK",
    );
    assert_eq!(
        broker.session_count(),
        1,
        "the session outlives the local viewport"
    );
    target.kill_session().expect("cleanup kill");
}


    // Operator B: dial A, open the attach stream, request the session.
    let mut operator = connect_retry(&name_b);
    let b_node = operator
        .net_status()
        .expect("b status")
        .node_id_hex
        .expect("node id");
    let conn = operator.net_dial(a_addr, Some(1)).expect("dial");
    let stream_b = request_attach(&mut operator, conn.conn_id, sid, 0, 2).expect("request");
    operator
        .net_stream_subscribe(stream_b, 0)
        .expect("operator subscribe");

    // Target A: the attach stream arrives; serve it on its own thread under
    // the handshake-proven origin (KH 7.5 — the stream table, not payload).
    let (stream_a, origin) = wait_for_stream(&mut target);
    assert_eq!(
        origin, b_node,
        "serve gate subject IS the QUIC handshake identity"
    );
    let server = thread::spawn(move || {
        let outcome = serve_attach(&mut target, stream_a, "ling", &origin, 0).expect("serve");
        (outcome, target)
    });

    // B types a marker; A's child echoes it; B renders it from the wire.
    send_attach_input(&mut operator, stream_b, b"REMOTE_DRIVE_OK\r", 1).expect("input");
    let mut decoder = AttachDecoder::new();
    let (mut cursor, mut viewport) = (0u64, Vec::new());
    render_until(
        &mut operator,
        stream_b,
        &mut decoder,
        &mut cursor,
        &mut viewport,
        b"REMOTE_DRIVE_OK",
    );

    // Detach: B finishes its send side; the serve loop ends with the session
    // still alive on A (viewport over, compute stays remote).
    operator
        .net_stream_send(stream_b, &[], None, true)
        .expect("detach");
    let (outcome, mut target) = server.join().expect("serve thread");
    assert_eq!(outcome, AttachServeOutcome::Detached);
    assert_eq!(
        broker_a.session_count(),
        1,
        "the session outlives the viewport"
    );
    target.kill_session().expect("cleanup kill");
}

    // Operator B: dial A (CROSS-NODE QUIC conn), then drive + detach over the
    // SHARED attach pump. The serve gate sees the QUIC handshake identity.
    let mut operator = connect_retry(&name_b);
    let b_node = operator
        .net_status()
        .expect("b status")
        .node_id_hex
        .expect("node id");
    let conn = operator.net_dial(a_addr, Some(1)).expect("dial");
    let (_viewport, mut target) = attach_drive_detach(
        &mut operator,
        target,
        conn.conn_id,
        sid,
        "ling",
        &b_node,
        b"REMOTE_DRIVE_OK",
    );
    assert_eq!(
        broker_a.session_count(),
        1,
        "the session outlives the viewport"
    );
    target.kill_session().expect("cleanup kill");
}

// [int->REQ-RC-1] LOCAL attach rides the byte-identical pump (M12 W1.5, B1):
// a single broker spawns a real PTY session; the operator acquires a
// broker-minted in-process LOOPBACK conn (`net_dial_loopback` — NOT a QUIC
// self-dial, which iroh refuses) and drives the PTY through the SAME
// `serve_attach`+render pump a cross-node operator uses. The proof that "both
// transports → one pump" is BY CONSTRUCTION: this test and the cross-node
// `remote_attach_drives_a_real_pty_cross_daemon` call the identical
// `attach_drive_detach` helper; they differ only in how `conn_id` is acquired
// (`net_dial_loopback` vs `net_dial`) and in the expected origin. The loopback
// origin is THIS node's own id, gating same-node (access short-circuit Allow in
// production; default-open in this hermetic home — both Allow). The session
// outlives the viewport.
#[test]
fn local_attach_via_loopback_conn_rides_the_same_pump() {
    init_home();
    let dir = tempfile::tempdir().expect("tempdir");
    let name = unique_name();
    let broker = net_broker(&name, &dir.path().join("solo"));

    // One broker plays BOTH target and operator (the local case). Spawn the
    // echo child, then attach to it over a loopback conn from a second brain
    // connection to the SAME broker.
    let mut target = connect_retry(&name);
    let sid = target
        .spawn_session(echo_spawn_req())
        .expect("spawn echo child");
    // The loopback peer's origin is this node's OWN broker-minted id — the same
    // value `net_dial_loopback` returns as `remote_id_hex`.
    let own_origin = target
        .net_dial_loopback()
        .expect("loopback dial (target side, for the origin)")
        .remote_id_hex;

    let mut operator = connect_retry(&name);
    let dialed = operator.net_dial_loopback().expect("operator loopback dial");
    assert_eq!(
        dialed.remote_id_hex, own_origin,
        "the loopback conn is the broker singleton — same own-node origin"
    );
    let (_viewport, mut target) = attach_drive_detach(
        &mut operator,
        target,
        dialed.conn_id,
        sid,
        "ling",
        &own_origin,
        b"LOCAL_DRIVE_OK",
    );
    assert_eq!(
        broker.session_count(),
        1,
        "the session outlives the local viewport"
    );
    target.kill_session().expect("cleanup kill");
}

let a_addr = target.net_status().expect("a status").addr;

-    // Operator B: dial A, open the attach stream, request the session.

+    // Operator B: dial A (CROSS-NODE QUIC conn), then drive + detach over the

+    // SHARED attach pump. The serve gate sees the QUIC handshake identity.

-    let stream_b = request_attach(&mut operator, conn.conn_id, sid, 0, 2).expect("request");

-        .net_stream_subscribe(stream_b, 0)

-    // Target A: the attach stream arrives; serve it on its own thread under

-    // the handshake-proven origin (KH 7.5 — the stream table, not payload).

-    let (stream_a, origin) = wait_for_stream(&mut target);

-        "serve gate subject IS the QUIC handshake identity"

-    let server = thread::spawn(move || {

-        let outcome = serve_attach(&mut target, stream_a, "ling", &origin, 0).expect("serve");

-    // B types a marker; A's child echoes it; B renders it from the wire.

-    send_attach_input(&mut operator, stream_b, b"REMOTE_DRIVE_OK\r", 1).expect("input");

-    let mut decoder = AttachDecoder::new();

-    let (mut cursor, mut viewport) = (0u64, Vec::new());

+    let (_viewport, mut target) = attach_drive_detach(

-    // Detach: B finishes its send side; the serve loop ends with the session

-    // still alive on A (viewport over, compute stays remote).

-        .net_stream_send(stream_b, &[], None, true)

-    let (outcome, mut target) = server.join().expect("serve thread");

-    assert_eq!(outcome, AttachServeOutcome::Detached);

+// [int->REQ-RC-1] LOCAL attach rides the byte-identical pump (M12 W1.5, B1):

+// a single broker spawns a real PTY session; the operator acquires a

+// broker-minted in-process LOOPBACK conn (`net_dial_loopback` — NOT a QUIC

+// self-dial, which iroh refuses) and drives the PTY through the SAME

+// `serve_attach`+render pump a cross-node operator uses. The proof that "both

+// transports → one pump" is BY CONSTRUCTION: this test and the cross-node

+// `remote_attach_drives_a_real_pty_cross_daemon` call the identical

+// `attach_drive_detach` helper; they differ only in how `conn_id` is acquired

+// (`net_dial_loopback` vs `net_dial`) and in the expected origin. The loopback

+// origin is THIS node's own id, gating same-node (access short-circuit Allow in

+// production; default-open in this hermetic home — both Allow). The session

+    let dir = tempfile::tempdir().expect("tempdir");

+    let broker = net_broker(&name, &dir.path().join("solo"));

+    // One broker plays BOTH target and operator (the local case). Spawn the

+    // echo child, then attach to it over a loopback conn from a second brain

+    let mut target = connect_retry(&name);

+        .spawn_session(echo_spawn_req())

+    // The loopback peer's origin is this node's OWN broker-minted id — the same

+    // value `net_dial_loopback` returns as `remote_id_hex`.

+        .expect("loopback dial (target side, for the origin)")

+    let mut operator = connect_retry(&name);

+    let dialed = operator.net_dial_loopback().expect("operator loopback dial");

+        dialed.remote_id_hex, own_origin,

+        "the loopback conn is the broker singleton — same own-node origin"

+        "the session outlives the local viewport"

+    target.kill_session().expect("cleanup kill");

// [unit->REQ-HAZARD-RESTART-IDEMPOTENT] the viewport survives a target-brain

// crash mid-attach: the successor re-serves the SAME broker-held stream from

// seq 0 (worst-case stale cursor) — the replayed Request/input/output all


Simplify — drop the redundant target-side loopback dial; use the operator's returned `remote_id_hex` as origin:


    let mut target = connect_retry(&name);
    let sid = target
        .spawn_session(echo_spawn_req())
        .expect("spawn echo child");
    // The loopback peer's origin is this node's OWN broker-minted id — the same
    // value `net_dial_loopback` returns as `remote_id_hex`.
    let own_origin = target
        .net_dial_loopback()
        .expect("loopback dial (target side, for the origin)")
        .remote_id_hex;

    let mut operator = connect_retry(&name);
    let dialed = operator.net_dial_loopback().expect("operator loopback dial");
    assert_eq!(
        dialed.remote_id_hex, own_origin,
        "the loopback conn is the broker singleton — same own-node origin"
    );
    let (_viewport, mut target) = attach_drive_detach(
        &mut operator,
        target,
        dialed.conn_id,
        sid,
        "ling",
        &own_origin,
        b"LOCAL_DRIVE_OK",
    );

    let mut target = connect_retry(&name);
    let sid = target
        .spawn_session(echo_spawn_req())
        .expect("spawn echo child");

    // The operator acquires the broker's loopback conn; its `remote_id_hex` is
    // this node's OWN broker-minted id — the origin the peer row carries and the
    // serve gates same-node against.
    let mut operator = connect_retry(&name);
    let dialed = operator.net_dial_loopback().expect("operator loopback dial");
    let own_origin = dialed.remote_id_hex.clone();
    let (_viewport, mut target) = attach_drive_detach(
        &mut operator,
        target,
        dialed.conn_id,
        sid,
        "ling",
        &own_origin,
        b"LOCAL_DRIVE_OK",
    );