docs: record #1847/#1848 fix row build, review and gate

BUILD-LOG.md

@@ -6319,3 +6319,4 @@ R5 quote fallback room (#797 D3, 2026-11-06, MVP3 lead): r4 review P2 found that
 2026-11-06 UTC | #797 round A fix r2 (Sol r1 P2 + two P3) | Before (97d670da9): a remembered request-not-found was retried only when the newest message on a caught-up thread changed, so a request opened with no new message stayed hidden; misses grew with paged history; an aborted read got a fabricated 404. After: misses are also cleared when the owner opens the thread (navigated) and when a mosaic-request-state for the id is seen anywhere on the page; timer refreshes and repaints still never retry. Misses are pruned to ids in the retained rows (200-row cap). An already-aborted read bypasses the memory and keeps the native AbortError. Remaining limit: the thread page reads only messages, so an event-only open with the thread left open and no navigation shows at the next message, navigation or reload. Closing that needs a server-visible thread signal, outside this change. New tests fail on 97d670da9 chat.js (2/2); webui chat-sessions-access, chat and browser files 40/0/0 (Node 26 serial). Evidence: /mnt/storage/scratch/mosaic-lead/mvp3/roundA-fix-r2-evidence/.
 2026-11-06 UTC | #797 round A fix r3 (Sol r2 P2) | Before (16384bb12): a mosaic-request-state for an id advanced the thread's epoch only when a remembered miss was deleted, so a 404 still in flight from before the observation could record the miss afterwards and timer refreshes kept fabricating 404s for an open request. After: each observed state advances that id's own generation on every thread that retains it; an in-flight 404 records a miss only if both the thread epoch and the id generation are unchanged. Other ids' slow misses still settle. Generations are pruned to retained rows with the misses. New held-404 test fails on 16384bb12 chat.js at recovery; webui chat-sessions-access, chat and browser files 41/0/0 (Node 26 serial). Lead ruling: no third review round. Evidence: /mnt/storage/scratch/mosaic-lead/mvp3/roundA-fix-r3-evidence/.
 2026-11-06 UTC | #797 round A fix r4 (Lead push gate red on 9d3eb9e11) | Before (9d3eb9e11): the chat.js fetch wrapper recorded a request-not-found from /api/requests/<id>/workspace as a missing request, then served a synthetic 404 to every later read of that id, including request panel rereads; request-browser.test.mjs failed 11/24 (its stub has no workspace route), base 6b84fe136 24/0. After: only the request's own read records a miss; a remembered miss still answers its workspace read in the page. New regression test fails on 9d3eb9e11 chat.js and passes on the fix. The r3 held-404 test raced Files' cached repaint under concurrency 3 (678/1; alone 5/5 pass); it now waits, bounded, for the refresh's reads to reach the server and still fails on 16384bb12. request-browser 24/0; whole webui suite except project-files 679/0/0/0 (Node 26, concurrency 3). Correction: the r1-r3 author gate ran only chat-sessions-access, chat and browser and omitted request-browser.test.mjs, which also exercises chat.js; that omission let this regression reach the push gate. Evidence: /mnt/storage/scratch/mosaic-lead/mvp3/roundA-fix-push-gate/r4-*.
+2026-11-06 UTC | #1847/#1848 fix row (Round B halt, key roundb-2-halt) | Before (1186cf7b1): the runner auto-replied a RESULT to every non-RESULT message, so chief INFO/RESULT replies to assistant RESULTs looped (thread 40df75c5, 54 messages, 1,036,184 assistant tokens); continuation notices keyed on business-wide launch/end/claim seqs, so every unrelated lifecycle event, including kill-switch ends during a halt, re-noticed the chief and drove 13 instance-running refusals (1,198,607 tokens). After: the broker adds in_reply_to_class to agent inbox rows and the runner sends no automatic reply to an agent's non-REQUEST reply to a RESULT (REQUEST, ordinary INFO and human/tester/user messages unchanged); continuation versions use only the target's own lifecycle events and claims, no notice while processing is halted or while the target's latest launch has not ended; the instance-running refusal tells the chief not to relaunch or relay. Builder 4048e0f60 (Codex Terra xhigh); Sol xhigh review r1 CHANGES: a halted broker restart failed on the new retry refusal (P1) and an older unmatched launch hid later ends, worsening #1851 (P2). Lead fix c04529c7b: startup request recovery waits while processing is halted or invalid, as the periodic pass does, and resume reschedules it; only the target's latest lifecycle event gates notices. Each regression test fails on its base. Gate on c04529c7b (Node 26.12.1): touched 123/0, bus except project-files 1648/0, harness 318/0, webui 678/1 then 679/0 on rerun (decide-browser I1 timed out under full-suite load; file alone 9/9 twice; no webui diff vs base). project-files.test.mjs hangs on base and candidate alike. Residual: a latest launch whose end is lost still suppresses notices until host recovery (#1851). Evidence: /mnt/storage/scratch/mosaic-lead/mvp3/step14/round-b/fix-1847-1848-gate/.

docs/SESSIONS.md

@@ -2108,3 +2108,4 @@ are never rewritten or removed; corrections are new entries.
 2026-11-06 UTC | mvp3-lead-797 (Claude, #797 lane) | roundA-fix r2 on 97d670da9 for Sol r1 P2/P3 | Missing-request memory now also clears on thread open and on an observed request state, is pruned to retained rows, and keeps AbortError; event-only open without navigation documented as a remaining limit. Negative 0/2 on 97d670da9, webui gate 40/0/0. Evidence: /mnt/storage/scratch/mosaic-lead/mvp3/roundA-fix-r2-evidence/.
 2026-11-06 UTC | mvp3-lead-797 (Claude, #797 lane) | roundA-fix r3 on 16384bb12 for Sol r2 P2 | A request state observed before an in-flight 404 settles now fences that miss via a per-id generation. Negative fails on 16384bb12, webui gate 41/0/0. Evidence: /mnt/storage/scratch/mosaic-lead/mvp3/roundA-fix-r3-evidence/.
 2026-11-06 UTC | mvp3-lead-797 (Claude, #797 lane) | roundA-fix r4 on 9d3eb9e11 for the Lead's red webui push gate | Workspace 404s no longer record a request miss; the r3 held-404 test waits for its refresh reads. request-browser 24/0, whole webui 679/0/0/0; r1-r3 gate omission of request-browser recorded in BUILD-LOG. Evidence: /mnt/storage/scratch/mosaic-lead/mvp3/roundA-fix-push-gate/r4-*.
+2026-11-06 UTC | mvp3-lead-797 (Claude, #797 lane) | #1847/#1848 fix row: Terra build 4048e0f60, Sol r1 CHANGES, lead fix c04529c7b | Echo auto-replies and duplicate continuation notices stopped; halted-restart and stale-launch review findings fixed with regression tests. Gate touched 123/0, bus 1648/0 (project-files excluded, hangs on base), harness 318/0, webui 679/0 on rerun. Not pushed; Lead pushes. Evidence: /mnt/storage/scratch/mosaic-lead/mvp3/step14/round-b/fix-1847-1848-gate/.