**W2b LANDED (doyle gate, 2026-09-16 04:51Z):** PR spt-bs-core#228 → main ff `4b6b03cc → 39241675` (todlando's 07975fe0 rebased by doyle onto 4b6b03cc; only the two changelogs conflicted, union; every other touched file carries exactly main's own delta, attach.rs hunk identical). CI 35055415355 5/5. Gate on the candidate (receipt `.spt/preserved/307/gate-228/receipt.txt`): checker 0.4.1 exit 0; hertz's `refresh_freeze` rig cell PASS twice on real broker/ConPTY/piped rc (8/8 checks both runs: real refresh, bounded ACK recovery, all post tags accounted, zero replacement write-poison, detach-only closures; recovery 8422 ms / 3188 ms; teardown CONFIRMED_GONE, 0 survivors); attach/rc seam suite 100/100; xtask gen/check 0. Blind read: product change is the one-line no-ACK replay at the shared pending drain; the rewritten controller-writer comment verified against main. Cosmetic: three rustfmt reflows rode along in attach.rs. Rides #307 / v0.71.0 golden (refresh_freeze now in the HEAVY set, golden Phase B Windows pins SPT_REFRESH_RIG_PYTHON).