fix(server): stop a second server from resending Claude turns

[Gigioxx]

Fixes #13275.

When two servers share one state directory (for example the desktop backend and a background service on the same T3 home), a Claude thread can get the same user message as a second, concurrent turn.

This happens when server B rejects any command because its in-memory read model is stale. reconcileReadModelAfterDispatchFailure re-reads every event persisted since B's snapshot, projects it, and then publishes it on B's event bus. Those events include server A's thread.turn-start-requested. B's ProviderCommandReactor has never seen that command, so it resumes the same Claude session in a new CLI and sends the message again. The duplicate turn has no pending_message_id, which is why the report shows more turns than requests.

Fix

• Reconcile still projects every recovered event, so B's read model catches up.
• It only republishes the events this dispatch appended, tracked by event id. This is the case the reconcile path was added for: events that were persisted even though the dispatch failed.
• Events written by another server are not republished, even for a retry with the same command id, so local reactors do not redo that server's work.

#9652 (one server per state directory) is the broader fix. This change stops the duplicate turns even while two servers share a directory.

Tests

• New: OrchestrationEngine.test.ts, "does not republish events written by another server when reconciling". Two engines share one SQLite file. A starts a turn. A retry of that command reaches B before A's receipt is visible, and B rejects it because its model is stale. B then dispatches its own command. The first event B publishes must be its own. The test fails on main (B republishes A's project.created first) and passes with the fix.
• 99 tests pass in OrchestrationEngine and ProviderCommandReactor. Server typecheck, lint and format are clean.
• Live repro with two servers on one state dir and a real Claude thread:
  • Before the fix: one rejected project rename on B caused B to start a second Claude CLI on the same session and re-send both earlier messages as new turns.
  • After the fix: the same steps produced no new provider events and no extra turns.

This change was made by Claude Opus 5.5 with Claude Code.

Summary by CodeRabbit

• Bug Fixes
  • Fixed an issue where recovery after a failed update could replay events created by another server using the same database. This could trigger duplicate background actions, such as sending a turn more than once. Recovery now processes only events from the current operation, helping prevent duplicate actions while keeping shared-server updates isolated.

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Approvability

Verdict: Approved at cc0a67d

Macroscope's review found this PR approvable — This narrowly scoped fix prevents reconciliation from republishing events written by another server while preserving read-model recovery and replay of the failed command’s own events. Its production impact is confined to failed-dispatch recovery and is covered by a focused shared-database test.

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📝 Walkthrough

Walkthrough

The orchestration engine now limits reconciliation replay to events appended during the current dispatch. A test simulates a retry by another server sharing SQLite and checks that the retry does not republish the first server’s event.

Changes

Reconciliation event publishing

Layer / File(s)	Summary
Track appended events and verify shared-database retries apps/server/src/orchestration/Layers/OrchestrationEngine.ts, apps/server/src/orchestration/Layers/OrchestrationEngine.test.ts	The engine records IDs for events appended during a dispatch and replays only persisted events with those IDs after a dispatch failure. The test removes the first server’s command receipt, retries the original command on the second server, and checks that the next event on its stream comes from a subsequent metadata update.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to bbe0a

The change addresses duplicate provider turns during shared-state retries, with no identified issue requiring a fix before merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…
Title check	✅ Passed	The title clearly and concisely describes the primary fix: preventing a second server from resending Claude turns.
Description check	✅ Passed	The description explains the problem, root cause, implementation, tests, and observed behavior. It is focused and provides the required rationale, despite using custom headings instead of the exact te…
Linked Issues check	✅ Passed	The description references issue #13275 and explains how the change addresses duplicate Claude turns. It also identifies #9652 as the broader related fix.
Out of Scope Changes check	✅ Passed	The changes are limited to orchestration reconciliation behavior and a focused regression test. They match the stated objective and do not indicate unrelated work.

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Inline comments:
In `@apps/server/src/orchestration/Layers/OrchestrationEngine.ts`:
- Line 133: Update the reconciliation filter in the OrchestrationEngine dispatch
flow so commandId is not used as the writer identity, since retries can share
it. Track events committed by the current dispatch or use a persisted
dispatch-specific writer identity, and replay only events written by that
dispatch.

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