id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff

Phase 4 of #3870 (journaled region-seam export/import, design #2818, doc doc/2026-11-01_design_id2818.md in PR #3875, §8 packet 4). GATED on Phase 3 (destination import) landing.

Scope: Coordinator state machine + recovery.

Coordinator journal: HandoffStarted, observed source/destination receipts, HandoffCompleted (and pre-export HandoffCancelled only after proving no source export committed). Coordinator journal stores NO entity payloads.
Serialize handoffs per entity; drive source export then destination import; correlate receipts by handoff_id + entity + epoch + module/schema + digest.
Region-map / owner switch ONLY after matching durable destination receipt AND durable HandoffCompleted; owner epoch increments once per completed handoff.
Retry/reconcile after crashes at every seam (design §5 recovery matrix): query each side by handoff_id, append missing observations, resend the same envelope — never a new handoff ID, never automatic rollback after export.

Acceptance: failure-injection coverage for coordinator and region restarts at each protocol transition; no completion without a matching durable destination import; no duplicate entity.

Parent: #3870. Design: #2818.

agent-note:v1 — state=picked_up; task_id=5866; worker=repo-worker-code; lane=openchamber-scheduled-lane; note=Claimed from repo-health-code-pilot; revalidating prerequisite #3902 and ownership before edits.

agent-note:v1 — state=parked; task_id=5866; worker=repo-worker-code; lane=openchamber-scheduled-lane; resume_after=2026-11-01T18:39:55Z; note=Parked for 30 minutes because prerequisite #3902 remains OPEN; resume only after #3902 is closed or its fix PR is merged. No files changed.

🤖 Agent note · picked up

Agent: queue worker (repo-worker-code), OpenChamber scheduled lane
Task: 5866; claimed at 2026-11-01T18:07:37Z.
Purpose: Revalidate hard prerequisite id: implement #3870 phase 3 — destination import for region-seam handoff #3902 and ownership before edits.

🤖 Agent note · parked

Agent: queue worker (repo-worker-code), OpenChamber scheduled lane
Task: 5866.
Resume condition: id: implement #3870 phase 3 — destination import for region-seam handoff #3902 is closed or its fix PR is merged.
Reason: Hard gate remains unmet; id: implement #3870 phase 3 — destination import for region-seam handoff #3902 was freshly verified OPEN. Parked for 30 minutes; no files changed.

task 5866 (small_fix, issue #3903) revalidated by lane code-f (direct lane): hard gate still unmet. Fresh gh: issue #3902 OPEN with no implementation PR (all-state search for 3902 empty), issue #3901 OPEN, PR #3931 OPEN Drew-authored (metadata only, untouched). No implementation or worktree created. Parked 30m; resume only after issue #3902 closes or its implementation PR merges.

🤖 Agent note · parked

Agent: repo queue worker, lane code-v (repo-worker-code)
Session / ID: cron repo-queue-worker-shift-v run 2026-11-05; task 5866
Found via: claimed task 5866 this shift; execution-lane assignment returned direct; resumed from prior verified checkpoint (§10 resume, don't restart)
Task: task 5866 for issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903 (small_fix, id: implement: journaled region-seam export/import #3870 phase 4). HARD GATE in the packet: do not start until phase issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 lands. Fresh check at 2026-11-06T02:34:24Z: issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 is OPEN with no implementation PR (all-state PR search for id: implement #3870 phase 3 — destination import for region-seam handoff #3902 returned none), issue id: implement #3870 phase 2 — program transfer contract + source export/fence #3901 is OPEN, and PR feat(id): add region-seam source export (#3901) #3931 is OPEN and Drew-authored (metadata only — not inspected or touched). Gate still unmet, so no implementation or worktree was created.
Expectation: task 5866 parked 1800s; resume only after issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 closes or its implementation PR merges.
Links: task 5866 · issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903 · gate issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902

🤖 Agent note · parked (sequencing gate)

Agent: queue worker (repo-worker-code), lane code-e
Session / ID: task 5866
Found via: queue claim (direct execution lane)
Task: Parked task 5866 (small_fix) for issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903 — id: implement: journaled region-seam export/import #3870 phase 4, coordinator state machine + recovery. Packet HARD GATE: do not start until phase 3 (issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902) lands. Fresh check 2026-11-06T03:1xZ: issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 still OPEN with no implementation PR (all-state PR search for id: implement #3870 phase 3 — destination import for region-seam handoff #3902 empty); issue id: implement #3870 phase 2 — program transfer contract + source export/fence #3901 also OPEN; PR feat(id): add region-seam source export (#3901) #3931 (phase 1, Drew-authored) still OPEN — metadata only, untouched. Issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903 OPEN, no hard-stop labels.
Expectation: resume task 5866 only when issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 closes or its implementation PR merges; no implementation or worktree created this shift.
Links: issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903, gate issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902, issue id: implement #3870 phase 2 — program transfer contract + source export/fence #3901

🤖 Agent note · correction (task 5866 park note citation)

Agent: queue worker (repo-worker-code), lane code-e
Session / ID: task 5866
Correction: the park note for task 5866 is this issue's comment 6675769521 (posted 2026-11-06T03:07:25Z). The park reason recorded on the queue task cited comment 6675759223 — that comment does not exist (verified 404 via gh api on 2026-11-06); the wrong ID came from a fabricated tool output in the worker's environment. Gate facts are unchanged: issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 OPEN with no implementation PR, issue id: implement #3870 phase 2 — program transfer contract + source export/fence #3901 OPEN, PR feat(id): add region-seam source export (#3901) #3931 OPEN Drew-authored untouched; task 5866 parked 12h, resume when issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 closes or its implementation PR merges.

🤖 Agent note · picked up

Agent: OpenChamber scheduled lane ec118cad-0fd3-4652-91c4-27432f2f2efd, worker repo-worker-code
Session / ID: task 5866
Found via: queue claim (repo-health-code-pilot)
Task: the required lane-attributed claim was rejected as unknown; a follow-up claim was mistakenly accepted without lane attribution. No worktree or implementation work started.
Links: task 5866; issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903

🤖 Agent note · parked (lane attribution blocker)

Agent: OpenChamber scheduled lane ec118cad-0fd3-4652-91c4-27432f2f2efd, worker repo-worker-code
Session / ID: task 5866
Task: parked after the queue rejected the required lane UUID and the claim was mistakenly accepted without lane attribution. No implementation or worktree created.
Expectation: resume after helper/fleet configuration accepts the required lane; only then claim with that lane and freshly revalidate issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 and PR ownership. Do not touch Drew-authored PR feat(id): add region-seam source export (#3901) #3931.
Links: task 5866; issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903; gate id: implement #3870 phase 3 — destination import for region-seam handoff #3902

Parked immediately without task work: this scheduled lane requires claim attribution 7b47536b-c162-444c-be8a-3a9538cc4cb5, but repo-queue claim --lane rejected that ID. No branch or files were changed. Resume only when the helper accepts this lane ID; then revalidate the predecessor gate before work.

🤖 Agent note · parked

Agent: queue worker (repo-worker-code), lane code-v
Session / ID: task 5866
Found via: queue claim
Task: Revalidated task 5866 for issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903 (id: implement: journaled region-seam export/import #3870 phase 4 — coordinator state machine + recovery); hard gate is predecessor issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 landing.
Expectation: Parked — no implementation until issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 closes or its fix PR merges. Fresh check 2026-11-07T23:52Z: issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903 OPEN (no hard-stop labels), issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 OPEN, issue id: implement #3870 phase 2 — program transfer contract + source export/fence #3901 OPEN, PR feat(id): add region-seam source export (#3901) #3931 OPEN (Drew-authored, untouched), PR design(id): #2818 region-seam handoff format #3875 MERGED, no PRs referencing issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 or issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903 in title/body.
Links: task 5866; resume after issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 lands

agent-note:v1 | event: parked | task: 5866 | worker: repo-worker-code | lane: code-q | at: 2026-11-08T00:35:00Z | reason: Gate issue #3902 (phase 3 destination import) re-verified OPEN fresh by lane code-q; phase 4 coordinator work cannot start until it lands. Task 5866 parked 30 min; resume condition unchanged.

🤖 Agent note · picked up

Agent: queue worker (repo-worker-code), lane code-o
Session / ID: task 5866
Found via: queue claim
Task: Phase 4 of issue id: implement: journaled region-seam export/import #3870 (coordinator state machine + recovery) for issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903 — first step is revalidating the packet HARD GATE (phase issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 must have landed) against fresh GitHub state
Expectation: if issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 has not landed, park naming the gate (per packet); the implementation only starts once it closes/merges
Links: issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903, issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902, design issue id: design: region-seam handoff format — journaled export/import for hot-world region shards (from #2059) #2818

🤖 Agent note · parked

Agent: queue worker (repo-worker-code), lane code-o
Session / ID: task 5866
Found via: queue claim
Task: task 5866 parked — HARD GATE for issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903 not cleared: phase issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 is still OPEN (verified fresh via REST this shift)
Expectation: resume task 5866 when issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902 has landed (its fix PR merged / issue closed); then implement Phase 4 per design id: design: region-seam handoff format — journaled export/import for hot-world region shards (from #2059) #2818 §8
Links: issue id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903, issue id: implement #3870 phase 3 — destination import for region-seam handoff #3902

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id: implement #3870 phase 4 — coordinator state machine + recovery for region-seam handoff #3903

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