{
  "changed": "crates/spt-daemon/src/deliverybytes.rs only",
  "behavior": [
    "Delivery writes mark active before physical I/O; successful digest publication precedes clearing active status.",
    "Reports during physical delivery return delivery-write-in-progress without holding a lock across PTY I/O.",
    "Physical delivery errors permanently latch delivery-write-unproven; later successful delivery cannot erase partial-write uncertainty."
  ],
  "integration": "Check delivery_unavailable_reason BEFORE delivery_matches; inverse order can miss an unpublished digest and then observe cleared status.",
  "tests": [
    "Added report_during_physical_write_declines_until_success_is_published with deterministic report callback inside write_input.",
    "Extended failed_physical_write_cannot_certify_omitted_or_partial_bytes to assert permanent delivery-write-unproven after a subsequent successful delivery."
  ],
  "validation": "Skipped as assigned; broker.rs untouched."
}