[codex] fix: ignore stale shell reducer events

[StiensWout]

Summary

• Ignore stale shell reducer events whose sequence is older than the current shell state.
• Preserve newer shell state when out-of-order lifecycle events arrive.

Root cause

The reducer accepted older sequence events after newer state had already been applied.

Impact

Out-of-order shell events no longer regress current shell state.

Validation

• PATH="$HOME/.vite-plus/bin:$PATH" vp test packages/client-runtime/src/state/shellReducer.test.ts
• PATH="$HOME/.vite-plus/bin:$PATH" vp check
• PATH="$HOME/.vite-plus/bin:$PATH" vp run typecheck

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Note

Low Risk
Small, pure reducer guard with targeted tests; shared by web/mobile but behavior is strictly more conservative on stale events.

Overview
applyShellStreamEvent now bails out before the event switch when event.sequence is less than or equal to the snapshot’s snapshotSequence, returning the same snapshot reference with no project/thread updates.

That stops duplicate or out-of-order orchestration shell stream events (e.g. late project-upserted) from overwriting newer local shell state on web and mobile. A unit test covers sequences 3 and 4 against a snapshot already at 4.

^{Reviewed by Cursor Bugbot for commit 8757ca5. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix applyShellStreamEvent to ignore stale shell reducer events

Adds an early return in applyShellStreamEvent that skips any event whose sequence number is less than or equal to the current snapshotSequence, returning the original snapshot reference unchanged. This prevents out-of-order or duplicate events from incorrectly mutating state.

^{Macroscope summarized 8757ca5.}

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[macroscopeapp]

Approvability

Verdict: Approved

Simple defensive guard that prevents stale events from being re-applied to the shell snapshot reducer. The change is minimal (2 lines), follows existing patterns in the file, and includes test coverage.

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