fix(server): let stopped threads settle immediately

[t3dotgg]

Stopping or interrupting a thread could make Settle fail for two minutes. The SQLite projection cleared the latest turn when the session returned to ready, so clients misclassified the last user message as a queued turn.

Keep the previous latest turn when a session has no active turn. The lifecycle test now verifies that turn history remains linked after the session ends.

Tested:

• vp test run apps/server/src/orchestration/Layers/ProjectionPipeline.test.ts
• vp run --filter t3 typecheck
• targeted format and lint checks

Made by GPT-5.6 Sol in T3 Code using the Codex harness.

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Note

Medium Risk
Changes orchestration projection semantics for all threads when sessions clear activeTurnId; low blast radius but affects settle and client turn classification.

Overview
Fixes Settle timing out and clients treating the last user message as a queued turn when a thread is stopped or interrupted.

On thread.session-set, the threads projector no longer writes latestTurnId from session.activeTurnId when that value is null. It keeps the existing projection_threads.latest_turn_id so a terminal session (e.g. ready with no active turn) does not wipe turn history.

The turn lifecycle test now asserts latest_turn_id stays set after the session ends.

^{Reviewed by Cursor Bugbot for commit 6374e09. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Preserve latestTurnId in projection when session.activeTurnId is null

When handling a thread.session-set event, the projector in ProjectionPipeline.ts previously overwrote latestTurnId with null if session.activeTurnId was absent. It now falls back to the existing latestTurnId value using null-coalescing. A corresponding test assertion was added to verify projection_threads.latest_turn_id is preserved correctly.

^{Macroscope summarized 6374e09.}

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[macroscopeapp]

Approvability

Verdict: Approved 26db156

Small defensive bug fix using nullish coalescing to preserve latestTurnId when a session terminates (activeTurnId becomes null). Clear intent, limited scope, and includes test verification.

No code changes detected at 6374e09. Prior analysis still applies.

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