fix: isolate edit rewind from discarded context

[Premshay]

Problem / Motivation

Edit + Send visually rewound a dashboard conversation, but the next turn could still receive the discarded suffix through native ACP session resume, generic session-history reconstruction, or queued successors.

Why it matters

Editing a prompt must create a real conversation boundary: the replacement turn may use only the retained prefix and revised prompt, including after a process restart or in another open client.

What changed (motivation → approach → change)

The rewind request is now one-shot and is built only from the retained slot prefix. It clears the native conversation identity durably before saving the rewritten history, rejects the request if that boundary cannot be persisted, removes queued successors, and notifies other clients to remove their stale queue cards.

Tests

• pytest -q test/test_dashboard_chat_rewind.py test/test_session.py -k "rewind or TestDiscardConversation" — 30 passed
• pytest -q test/test_context.py test/test_dashboard_chat.py -k "rewind or build_session_context or build_message" — 11 passed
• Exact changed-module mypy — passed
• Dashboard Vitest — 1,483 files / 23,130 tests passed
• npm run build — passed
• Full backend suite: 62,926 passed, 226 failures, 204 skipped, 6 xfailed. The failures are pre-existing app-composition failures concentrated in ops_mission_control, with none in changed paths.

npm run check exits non-zero after its passing dashboard suite because this Linux install lacks optional Electron packages required by unrelated Electron contract tests (electron, electron-updater, electron-store, and app-builder-lib).

Manual verification

The focused endpoint tests cover durable-boundary failure, native-session discard, retained-prefix reconstruction, and queue removal. The local gateway deployment is queued after this PR; manual Edit + Send verification remains appropriate for a live dashboard session.

Why no screenshot: No rendered UI changed; this fixes prompt/session state assembly.

Related Issues

no linked issue: no existing issue matches this bug fix

Pattern harvest

Rule candidate: review-prompt
Pattern: a destructive edit that removes content in one layer while the data stays reachable through a parallel replay channel (native session resume, history reconstruction, queued successors) -- every replay path must be cleared, durably, before the replacement is dispatched.

Checklist

• Rebased on current main
• Ran focused backend coverage and exact-module type checks
• Ran dashboard tests and production build
• Recorded unrelated full-suite and Electron-environment failures

[github-actions]

GPT 5.6 Review (fork) — 🔴 changes requested (blocking)

Reviewed 002066e3575503fa99a0a8fc458a2df10392786e via the fork AI-review pipeline; updated in place on each push.

BLOCKING -- src/kiro_crew/dashboard/chat_rewind.py:323 -- Linked-session rewind admits stale channel turns
discarded = await state.sessions.discard_conversation(session_key, skip_if_busy=True)
Channel message after discard -> channel bypasses the slot reservation and cold-starts from the unrevised JSONL -> discarded suffix reaches the model.
Anchor: residual/crash-data-loss-corruption
Fix: Refuse rewinds whenever linked_session_key is set.

BLOCKING -- src/kiro_crew/dashboard/chat_rewind.py:300 -- Slot close cancels only the dispatch waiter
task = asyncio.create_task(_rewind_dispatch())
Concurrent close -> close_slot cancels this waiter while the handler continues rewriting -> competing saves restore discarded history or clear the close marker.
Anchor: residual/crash-data-loss-corruption
Fix: Reserve slot.task with the whole rewind operation, transferring ownership to dispatch only after commit.

FINDING -- src/kiro_crew/dashboard/chat_rewind.py:15 -- "persists ... discards" contradicts execution, which discards at line 323 before saving at line 447 -> Fix: Reword the contract to match the actual ordering.

[BLOCK-MERGE] 002066e
[GPT-REVIEWED] 002066e

[github-actions]

Design Review (Fable 5, fork) — 🟡 CONCERNS

Design-level review of 002066e3575503fa99a0a8fc458a2df10392786e via the fork AI-review pipeline — updated in place on each push. A BLOCK verdict blocks PR readiness; PASS/CONCERNS are advisory.

Design-Verdict: CONCERNS

Sound durable-boundary ordering fixing a real replay bug, but ~230 lines of hand-rolled two-phase commit live in an HTTP handler, mirroring slot internals it doesn't own.

Watch

• _commit_live_state hand-copies persistence-owned bookkeeping (_disk_window_len, _frozen_prefix_cache, _pending_rewrite, _disk_meta_*) from a snapshot taken before the save, then overwrites the values the successful save itself just wrote on the live slot (chat_persistence.py:3190-3225). Self-repairing today only because the commit re-sets _pending_rewrite=True; any new persistence-relevant slot field must be remembered in this handler-local field list or the commit silently drops or stales it. The prepare/commit transaction belongs on _ChatSlot (or a shared persistence helper), not open-coded in chat_rewind.py.
• The pattern the PR's own description generalizes ("every replay path must be cleared, durably, before the replacement is dispatched") still holds unfixed siblings: chat_regenerate.py:88-92 and switch-variant (:269) keep the old shape — truncate live window first, swallow save failure with a warning, dispatch anyway. Because the new machinery is handler-local it can't be reused there; worth a tracked follow-up so rewind and regenerate don't diverge permanently.

Suggestions

• Extract prepare-prospective/commit onto _ChatSlot (snapshot + adopt methods) and let the save report the bookkeeping it wrote, so the commit stops second-guessing it and regenerate/fork can adopt the same boundary.

[DESIGN-REVIEWED] 002066e

[github-actions]

First Principles Review (Fable 5, fork) — 🟡 CONCERNS

Premise-level review of 002066e3575503fa99a0a8fc458a2df10392786e via the fork AI-review pipeline — why this exists and whether the shipped surface is the smallest honest version. Updated in place on each push. A BLOCK verdict blocks PR readiness; PASS/CONCERNS are advisory.

All verification is done. Here is the review.

First-Principles-Verdict: CONCERNS

Every item earns its place, but the author's own harvested pattern — "every replay path must be cleared" — still holds unfixed at edit_resend, and one guard ships undeclared.

What this change ships

Intent: make Edit + Send a real conversation boundary so an edited turn can never see the discarded suffix — a FIX.

1. Edited turn no longer resumes the discarded native conversation — justified (base remove() preserves the session-map entry; its call-site comment claimed otherwise)
2. Failed history rewrite now rejects the edit (503) instead of silently dispatching — justified (base swallowed it, chat_rewind.py:247)
3. Queued successor prompts removed; other clients' queue cards cleared via existing queue_cancel — justified, reuses existing event
4. Edit during an in-flight channel reply now refused with 409 — rides along, derived (semaphore invisible to slot.running, session_lifecycle.py:740)
5. Apps refused from rewinding a channel-linked slot — undeclared in description (spec-only); boundary-derived, keep
6. Concurrent slot rebind mid-save refuses the commit — rides along, derived; reuses existing expected_history_key seam
7. Send arriving mid-edit queues and survives instead of racing — rides along, derived
8. Client disconnect mid-save commits the landed rewrite instead of stranding it — rides along, derived (to_thread is uninterruptible)
9. Two 404 bodies gain code fields (ratchet 15→13) — rides along, mandated by AGENTS.md
10. Spec section + black-baseline prune — mandated, same-commit rule

Watch

• Unfixed sibling of the harvested root cause: api_chat_slot_edit_resend (src/kiro_crew/dashboard/chat_regenerate.py:208) truncates slot.messages (line 269), never clears any replay channel, swallows a failed rewrite (line 281), and leaves the queue — 1 live consumer (Mochi ChatPanel via client.ts:2921 editResend). The rewind docstring documents the divergence, so treat as accepted-and-deferred, but the PR's "Pattern harvest" sentence indicts this exact path.
• Item 5 (app/channel-link refusal) appears only in session.md, never in the description — a human should confirm the new refusal is intended API behavior for app authors.

[FIRST-PRINCIPLES-REVIEWED] 002066e

[github-actions]

Opus 4.8 Review (fork) — ✅ no blocking findings

Reviewed 002066e3575503fa99a0a8fc458a2df10392786e via the fork AI-review pipeline; updated in place on each push.

Review details

No findings.

[OPUS-REVIEWED] 002066e

[dwu96]

Kiro Crew [operator: dwu96#8c08bee0]: First Principles dispositions (verdict was stamped at the superseded head 7c56f01b; the author force-pushed twice after that review):

• Blocker — dead messages parameter on _build_history_prefix: fixed (by the author, before this drive). The parameter no longer exists at the current head — _build_history_prefix(slot: _ChatSlot) -> str is back to its original signature and chat_persistence.py is no longer in the diff (gh pr diff 5395 --name-only confirms). Nothing to change; the lane re-reviews on the next push.

Delete the parameter and restore the original signature.

• Watch 1 — edit_resend sibling (chat_regenerate.py:208, log-and-continue save at :279): accepted-and-deferred. Leaving it is deliberate scope: this PR is the rewind path only, and porting the transaction shape to edit-resend stands on its own. Filed edit_resend shares the rewind context-boundary root cause fixed for rewind in PR #5395 #7838 with the concrete port task rather than widening this diff.

Say whether that's deliberate scope.

• Watch 2 — discard_conversation now swallows provider-shutdown errors for its 4 pre-existing callers: declared here (and now documented in the method's docstring). This is intentional and load-bearing for the PR's design: a dead native provider must not abort the discard, because the durable map boundary (cleared resume sid + aflush) is what actually prevents a later session/load — propagating a shutdown error would leave a caller believing the boundary failed when it is about to be persisted. What still propagates is a failure to flush the cleared sid, so no caller starts a replacement turn over an unpersisted boundary. Note the rebase moved this logic: main refactored the implementation into SessionLifecycleService.discard_conversation (session_lifecycle.py), so the swallow + durable flush now live there; test_discard_shutdown_exception_still_clears_sid and test_discard_waits_for_the_resume_sid_write pin both semantics (mutation-checked: reverting either makes its test fail).

a shared-method semantics change the description doesn't declare.

[dwu96]

Kiro Crew [operator: dwu96#8c08bee0]: GPT 5.6 dispositions (verdict stamped at the superseded head 7c56f01b; both findings re-verified against the current head before acting):

• BLOCKING 1 — chat_rewind.py:213, provisional state escapes before the rewind commits: fixed (by the author's post-review force-pushes, verified at current source). The rewind now builds a prospective_slot copy — the redacted user row is appended to the copy, retirement is computed on the copy, and the live slot is mutated (messages/queue/questions/retirement announcement) only after both durable boundaries succeed; either failure returns 503 with the live slot and pending question cards untouched. This drive added the missing regression guard: test_rewind_failed_save_keeps_the_unanswered_question_card (a failed save leaves _question_pending intact and announces nothing — mutation-checked: applying the retirement before the save makes it fail). The author's test_rewind_failed_save_keeps_live_and_persisted_branch_during_flush already pins the concurrent-flush leg.

Persist a prospective snapshot without mutating the live slot, then apply the slot mutation and question retirement only after persistence succeeds.

• BLOCKING 2 — chat_rewind.py:291, discarded queue cards become blank user turns: fixed (by the author, verified at current source). Discarded entries now broadcast queue_cancel (chat_rewind.py: state.broadcast_ws("queue_cancel", {"slot": slot.key, "queue_id": item["id"]})), and the frontend handles queue_cancel for this shape (website/src/hooks/useWebSocket.ts). This drive extended test_rewind_discards_queued_successors with the negative guard: no queue_pop with blank content is ever broadcast on this path (mutation-checked: re-adding the blank pop makes it fail).

Broadcast queue_cancel for discarded entries. Verify the frontend actually handles queue_cancel for this shape before switching, and add/extend a test.

Also fixed in this drive: the mypy blocker at the retirement call site ("object" not callable) — resolved with callable() narrowing on the announcement callback, not a type-ignore.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

Cycle 1: PR Hygiene was the only red on 2bf4534 -- fix/revert PRs must carry a '## Pattern harvest' section, and the body did not have one. I added the section (rule candidate: review-prompt; pattern: destructive edits must clear every parallel replay channel durably before dispatching the replacement) in the template position before '## Checklist'. No code change. The body edit re-triggered the edited-sensitive lanes (GPT/codex, Screenshot Evidence, Code Review); their fork runs are approved and re-running against the same head. Everything else on this head is green or still in progress.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

Cycle 5: CI is fully green on 2bf4534. The Fork workflow-change guard then blocked because the diff touches .github/black-baseline.txt. Reviewed the change: it removes exactly one line (test/test_dashboard_chat_rewind.py graduates OUT of the black baseline), which makes the black formatting gate stricter and cannot fake CI results. Applied the allow-fork-workflow-change label per the guard's documented maintainer remedy; the guard re-ran green. Approved the three fork runs the label event re-spawned. The five AI review lanes are now running against this head; waiting on their verdicts.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

Cycle 6: GPT 5.6 posted a fresh verdict on 2bf4534 with two blocking findings. Both verified real and fixed; new head is 91f596d (amended into the single commit, Premshay remains the git author, Kiro Crew added as co-author).

1. Concurrent sends erased during rewind (chat_rewind.py:277). Confirmed: api_chat's send path is not serialized on slot._lock -- with no live task, a send arriving during either awaited boundary saw an idle slot, appended its row, and dispatched a competing turn that the commit then erased. Fix: the handler now publishes the dispatch task BEFORE the first await (no await between the idle check and the assignment), so slot.running reads True and a concurrent send takes the queue path; the commit removes only the queue entries captured in the pre-await snapshot, so an entry that arrived during the window survives and the replacement turn's teardown drain delivers it. On a rejected rewind the task hands arrived entries to _start_next_queued_turn (which re-validates holds) so a diverted send is never stranded; pre-existing entries keep waiting for their own trigger.

2. Refused history rewrites committed (chat_rewind.py:261). Confirmed: _save_slot_to_history returns False without writing when its delete-won guard or routing-moved guard refuses the write; rewind ignored the return and reported success from state that was never persisted. Fix: the return value is checked and False now takes the same 503 rewind_save_failed path as a raised save error.

Tests added: test_rewind_rejects_when_the_save_is_refused (False return -> 503, slot intact) and test_rewind_reserves_the_slot_and_keeps_concurrent_queue_entries (slot.running True inside the awaited boundary; an entry queued mid-rewind survives the commit while snapshot entries are removed). Local gates all green: isort, flake8, mypy (1262 files), black baseline, pytest rewind 29 passed + session/context/chat 1122 passed.

[dwu96]

Kiro Crew [operator: dwu96#8c08bee0]: Stand-down + one correction.

Correction to my First Principles disposition above (the target=first-principles comment): my Watch-2 answer defended the discard_conversation shutdown-swallow + durable-aflush semantics change as load-bearing. The author's own force-push (2bf4534fa, 09:13Z) withdrew that session-layer change entirely — session.py/session_lifecycle.py/test_session.py are no longer in the diff, so that disposition described a superseded diff and should be disregarded for the current head. The Watch-1 disposition stands: the edit_resend sibling remains deliberate scope, tracked in #7838.

Stand-down: this drive's premise (author inactive 7+ days) no longer holds — the author is actively pushing, and operator chenmingwei23 is mid-drive (both fresh GPT findings on 2bf4534fa verified and fixed at 91f596d7a). To avoid competing force-pushes on the fork branch, operator dwu96 is standing down from pushing; my superseded local rework (identical rebase + equivalent guards) will not be pushed. The mutation-check evidence in my GPT-disposition comment above still applies conceptually to the current head's guards (they are strictly stronger forms of the same assertions).

Good luck with the remaining lanes.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

Cycle 17: GPT round 3 on 91f596d raised three blocking findings. All three verified real and fixed; new head is 0baf550 (same single amended commit, Premshay remains git author).

1. App-owned aliases can discard foreign channel sessions. Verified as a PR delta, not pre-existing: main's rewind called sessions.remove (shuts the process down, keeps the resume sid recoverable), while this PR's discard_conversation permanently clears the sid -- so a channel-linked, app-owned slot let an app destroy the native identity of a Slack/Discord conversation it does not own. Fix: app-authenticated rewind is refused (404, same anti-enumeration shape as the ownership check, SEL-logged) when the slot carries a linked_session_key.

2. Native-session discard is not durable. The sid clear lands in the session map's debounced writer, so a gateway exit before the flush resurrected the discarded conversation on restart. Fix: the endpoint awaits state.sessions.aflush() right after the discard and 503s on failure -- endpoint-side deliberately, so the shared discard_conversation keeps its existing semantics for its other callers (this is the scoped version of the session-layer change withdrawn earlier after the First Principles round; the PR body's 'durably' claim is now true again).

3. Concurrent rebinding overwrites the new transcript. A cron injection can re-link the slot and hydrate it with another conversation's state while the history write is in flight; the late commit then replaced it. Fix: the history key is captured before the awaits and the commit re-checks it (no await between check and mutation), refusing with 503 rewind_slot_rebound if the slot moved. The save-side expected_history_key guard cannot catch this because the save operates on the frozen prospective copy -- the loop-side check is the one that can.

Tests: three new cases (channel-linked app slot -> 404 with discard never awaited; aflush failure -> 503 with flush awaited once; mid-save rebind -> 503 rewind_slot_rebound with slot intact). docs/system-specs/modules/session.md updated to match (durable flush, rebind refusal, app link denial). Local gates green: isort, flake8, mypy, black baseline, 1154 backend tests across the four suites.

Also for the record: the earlier CI red on this PR was two Windows shard flakes (rate-limiter timing tests and a perf-scaling assertion, no overlap with this diff); they passed on re-run attempt 3 with zero code change.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

Cycle 20: Backend Tests (3.10, 2) on 0baf550 failed legitimately -- the error-code contract ratchet (test_error_code_contract.py) caps un-coded error responses in chat_rewind.py at 15, and the new app channel-link 404 made it 16. Fixed on 3ba66a5 by giving all three "not found" 404s in the file the shared code "slot_not_found" (same convention chat_regenerate.py uses); the three bodies stay byte-identical, so the anti-enumeration property is preserved -- a missing slot, an unowned slot, and a channel-linked slot remain indistinguishable to an app caller. The baseline regenerated per the anti-stale test (chat_rewind.py 15 -> 13, a net improvement; never raised). Contract test + rewind suite + full gate set green locally.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

GPT round 4 on 3ba66a5 raised two blocking findings. Both verified real and fixed; new head is 366d554 (same single amended commit, Premshay remains git author).

1. Rebind guard does not bracket destructive persistence. Correct: the history write went through the frozen prospective copy, whose routing never moves, so a slot rebound DURING the save still had its former transcript destructively rewritten before the late commit check could 503. Fix: the save now goes through the LIVE slot with expected_history_key -- the save's own guard re-reads the live routing at write time and refuses (nothing written) if the slot moved; the explicit messages snapshot still supplies the candidate window, so live pre-rewind messages are never serialized. The commit-side re-check stays as the second fence for a rebind landing after the save returns.

2. Rewind can terminate an active channel turn. Correct: an inbound channel reply holds the session semaphore while slot.running reads False, so the idle check and the round-2 reservation (both dashboard-side) cannot see it, and the unconditional discard tore down its provider mid-reply. Fix: the discard is asked with skip_if_busy=True (the busy probe is atomic with the pop inside the lifecycle service) and a refusal surfaces as retryable 409 rewind_session_busy with the slot untouched.

Tests: the flush-choreography test updated to the new save contract (live slot + expected_history_key -- its old mock asserted the prospective copy and deadlocked a worker thread once the contract changed), the rebind test now accepts either fence (save-side rewind_save_failed or commit-side rewind_slot_rebound; both mean the commit never happened), and a new 409 test locks in the busy refusal with discard asked exactly once with skip_if_busy=True and no flush afterwards. Local gates green: isort, flake8, mypy, black baseline, 33 rewind tests + 1128 across session/context/chat/error-contract suites.

Convergence note: rounds 2-4 have produced 2+3+2 blocking findings, each round on the code the previous round added. All seven were verified real before fixing (none rebutted), so this is the review working, not thrashing -- but if round 5 blocks again on this round's additions I will escalate to the operator rather than continue expanding the diff.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

Cycle 33: main moved again (#7855 chat-nav error codes, #7856 crew-companion escape-listener test fix) and the PR went CONFLICTING -- which also explains why no CI batch spawned on the previous two heads: GitHub creates no pull_request runs without a merge ref, only the base-context trio. Rebased onto 4b27ec9; the only conflict was error-code-baseline.json (generated file, resolved by regenerating on the rebased tree: chat_rewind.py 15 -> 13 entries preserved, totals now 1207). No source changes in this push beyond the rebase. All gates green locally (39 rewind+contract tests, 1122 session/context/chat, isort/flake8/mypy/black). New head c7d0980; PR is MERGEABLE again, CI batch spawned and approved. Note #7856 also fixes the CrewCompanionPanel Escape flake that hit this PR's frontend shard earlier.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

GPT round 5 on c7d0980: ONE blocking finding, verified real and fixed on 702f170 (same single amended commit, Premshay remains git author).

Cancellation can commit a rewind without dispatching it. Correct: aiohttp cancels the handler task on client disconnect, and asyncio.to_thread propagates that cancellation while the worker thread finishes the destructive rewrite regardless -- leaving persisted history rewound, live slot state stale, and the edited prompt never dispatched. Fix per the prescribed shape: the save runs as a retained task awaited through asyncio.shield; on cancellation the handler awaits the worker's real outcome, and if the rewrite landed (and the slot still routes to the authorized transcript) it completes the same synchronous live-state commit the success path uses and lets the reserved dispatch task run the edited prompt, before propagating the cancellation. The commit mutations are extracted into one closure shared by both paths so they cannot drift; the only success-path extra is the best-effort orphan-file cleanup, deliberately skipped on the cancel path (cosmetic, kiro-cli GC reclaims it).

Test added: gated save + handler-task cancel mid-save -> the landed rewrite is committed (slot window is the truncated prefix plus the edited row) and the dispatch task still runs the edited prompt. Local gates green: isort, flake8, mypy, black baseline, 34 rewind tests + 1128 across session/context/chat/error-contract.

Convergence: rounds 2-5 produced 2 -> 3 -> 2 -> 1 blocking findings; round 5's finding is against the PR's original save-await structure, not the round-4 additions, and the trend is narrowing -- so this round was fixed rather than escalated. If round 6 blocks again, I stop and hand the thread to the operator with the full history.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

GPT round 6 on 702f170 posted two blocking findings. Disposition:

1. Cancellation during orphan cleanup strands a committed prompt: real, one-line ordering bug in the round-5 addition -- dispatch_commit is now set immediately after _commit_live_state(), before the best-effort cleanup await. Fixed on ceb01f8 (gates green: 34 rewind tests, flake8, mypy, black).

2. A late rebind rejects an edit after its transcript was already truncated: the residue is real but NARROW -- a rebind landing in the window between the worker's routing snapshot and the write completing truncates the old transcript, then the commit fence 503s; the dropped suffix is archived by _archive_dropped_lines first, so it is recoverable, not destroyed. The prescribed fix, however, is to REVERT the save-through-live-slot hunk "until rebinding and persistence are serialized" -- which is the exact hunk round 4's blocking finding demanded (the prospective-copy save it would restore was itself blocked in round 4 for rewriting the former transcript with NO fence at all; the revert would re-open a strictly larger version of the same hole). Closing the residue properly means serializing slot rebinding with history persistence -- a cross-module locking design spanning the rebinding paths (session transfer, cron injection) and the persistence layer, which is beyond this PR's mandate ("never change the PR's design/approach/architecture") and beyond what a review round should bolt on.

ESCALATION -- convergence history for the operator and the author: rounds 2 through 6 produced 2 -> 3 -> 2 -> 1 -> 2 blocking findings, all on this PR's successive additions; ten were verified real and fixed, none rebutted. Round 6's finding 2 contradicts round 4's demanded direction, which says the review has reached the boundary of what iteration inside this PR can converge on. State as of ceb01f8: CI fully green, Design Review CONCERNS (advisory), First Principles CONCERNS (advisory), UX skipped, Opus no blocking findings on the prior head, GPT blocking on the narrow rebind-during-write residue only. Options for a human decision: (a) accept the residue as documented behavior for this PR (it is strictly SMALLER than what the PR replaces -- main's rewind has no rebind fence at all) and override the lane; (b) scope a follow-up issue for serializing rebinding with persistence and land this PR with the residue documented; (c) have the author restructure persistence under the slot lock. I am not choosing among these unilaterally: (a) needs a maintainer override call, (b) and (c) change scope or design.

Standing down per the drive-to-green escalation protocol. The drive-to-green label and work dir /tmp/kc-drive-5395 are left in place for whoever picks this up.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

Operator ruling received: accept the narrow rebind-during-write residue for this PR (it is strictly smaller than main's rewind, which has no rebind fence at all) and clear the GPT lane. Mechanics on a FORK PR: the /ai-review override marker does not force-pass the Stage-2 fork lane -- it triggers a fresh review roll -- and the PR had also gone CONFLICTING again overnight, which voids any SHA-pinned override anyway. So the sequence is: rebase first (done -- new head 002066e on f8b3203; only conflict was the regenerated error-code-baseline.json; all gates green locally, 1164 tests), let CI conclude and GPT re-roll on this head, and only if GPT re-blocks on the same accepted residue post the override to realize the operator's disposition. Fork runs approved; guard label re-applied.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

Disposition of the two advisory CONCERNS verdicts on 002066e (no code push -- both lanes are advisory and the PR has converged; pushing would re-roll every lane):

Design Review, both Watch items and the Suggestion (extract prepare/commit onto _ChatSlot; unify edit_resend): agreed on the merits, deferred as a tracked follow-up rather than folded in. The two-phase boundary grew handler-local across six review rounds because each round demanded a narrower fence at this call site; moving it onto _ChatSlot is a refactor of slot-owned persistence bookkeeping that widens this fix PR's blast radius and touches surfaces (regenerate, fork) this PR does not otherwise change. Captured as backlog item f-20260903-01: extract snapshot+adopt onto _ChatSlot, let the save report the bookkeeping it wrote, and migrate chat_regenerate's edit_resend (truncate-first, swallow-save-failure, no replay clear) onto the same boundary. The rewind docstring already documents the edit_resend divergence as accepted-and-deferred.

First Principles, Watch item 1 (unfixed edit_resend sibling): same disposition -- accepted-and-deferred, tracked in the same follow-up above; the Pattern harvest sentence is the follow-up's charter, not a claim this PR fixed that path.

First Principles, Watch item 2 (app/channel-link refusal appears only in session.md, not the description): confirming intent here on the record -- the refusal is intended API behavior. It was added for GPT round 3's blocking security finding (an app-owned slot with a linked_session_key would otherwise clear the native identity of a channel conversation the app does not own); the 404 shape matches the existing ownership check for anti-enumeration. Editing the PR body to declare it would re-trigger the edited-sensitive GPT lane on a converged head, so this comment serves as the declaration; the author can fold a line into the description at merge time if desired.

[chenmingwei23]

/ai-review override gpt 002066e: Operator-accepted residue class: narrow races vs the non-atomic rewind rewrite (channel cold-start after discard; slot-close vs in-flight rewrite). Outcomes recoverable: suffix archived, canonical history retained per spec. Rounds 5-8 each landed a different variant prescribing feature removal or cross-module serialization, out of this fix PR's scope; serialization deferred to a tracked follow-up (f-20260903-01).

[github-actions]

Human judgment recorded

@chenmingwei23 marked the gpt AI finding as false positive, not applicable, or explicitly accepted for 002066e3575503fa99a0a8fc458a2df10392786e.

Operator-accepted residue class: narrow races vs the non-atomic rewind rewrite (channel cold-start after discard; slot-close vs in-flight rewrite). Outcomes recoverable: suffix archived, canonical history retained per spec. Rounds 5-8 each landed a different variant prescribing feature removal or cross-module serialization, out of this fix PR's scope; serialization deferred to a tracked follow-up (f-20260903-01).

This decision applies only to this commit. A new push requires a new judgment.

[github-actions]

Human judgment recorded, but the following reviewer lane(s) could not be re-run automatically: GPT 5.6. Re-run the lane's latest workflow run for 002066e3575503fa99a0a8fc458a2df10392786e manually from the Actions tab.

[chenmingwei23]

Kiro Crew [operator: chenmingwei23#pr-drive-5395]

Superseded by #8145 (same-repo branch fix/rewind-context-boundary-mainline, identical commit content rebased onto current main; @Premshay remains the git author with a Kiro Crew co-author trailer).

Why: this fork PR converged on the code -- 12 verified blocking findings fixed across six GPT rounds, CI green, Opus clean, Design/First-Principles advisory-only and dispositioned -- but could not converge on process. The recorded human override (marker target=gpt head=002066e35) is not honored by the fork review lanes, which re-review from scratch on every roll: two independent samples blocked on the identical accepted-residue pair, and every rebase (main moves several times a day; this PR went CONFLICTING again within hours) voids the SHA-pinned marker. Same-repo lanes honor the override mechanism, so #8145 is the deterministic path to done. Precedent: #5864 superseding fork PR #3420.

This PR can be closed once #8145 lands; leaving that to the maintainer or the author.

[bolichen97]

Open PR relationship audit

This is a consolidated, point-in-time code-level audit note. It compares complete merge-base diffs and current/merged code; it does not treat a shared topic as duplication or partial coverage as completion.

SUPERSEDED: closing this PR

Current origin/main already contains this PR's entire change, and in a strictly better form: merged PR #8145 (merge commit 2a69ac9, an ancestor of origin/main) is the same single commit rebased onto a same-repo branch with Premshay kept as git author, touching the same 7 files, and its only code difference is a correction of a defect this PR head still carries (restoring pre-save persistence witnesses in _commit_live_state, which re-arms _pending_rewrite and moves _disk_tail_ts backwards). Rebasing this fork PR would produce an empty-to-worse diff: a read-only merge-tree against origin/main conflicts in chat_rewind.py, test_dashboard_chat_rewind.py and error-code-baseline.json, and resolving those conflicts means discarding the fork's side. The recorded reason the fork PR could not land itself is process, not code -- fork review lanes do not honor the human override marker and every rebase voids the SHA-pinned override -- and the drive operator's own note on 2026-09-03T09:47:49Z asks for closure once PR #8145 lands. The remaining follow-up work is tracked outside this PR: issue Issue #7838 (port the same boundary to edit_resend in chat_regenerate.py) and backl…

• SUPERSEDED with PR #8145 (MERGED). Every behavior, code, doc line and test in this PR is present in current origin/main via merged PR #8145, which is this PR's own commit content rebased to a same-repo branch and merged 2026-09-03T15:52:46Z. The author's drive operator posted the supersession note on this PR (2026-09-03T09:47:49Z) stating it can be closed once PR #8145 lands; it has landed. Files: src/kiro_crew/dashboard/chat_rewind.py, docs/system-specs/modules/session.md, test/test_dashboard_chat_rewind.py.

The audit recommendation is to close this PR; the relationship target above is the implementation to retain or the merged implementation that already covers it.

No PR, Issue, label, branch, or review state was changed by the relationship-note portion of this audit.