GSD_MILESTONE_LOCK in state.ts:
- deriveState() filters milestoneIds to only the locked milestone
- getActiveMilestoneId() short-circuits when lock is set
- Each parallel worker sees only its assigned milestone
Signal consumption in auto.ts:
- handleAgentEnd() checks for coordinator signals before dispatching
- Responds to "stop" (calls stopAuto) and "pause" (calls pauseAuto)
- Only active when GSD_MILESTONE_LOCK env var is set
/gsd parallel merge command:
- /gsd parallel merge [mid] — merge specific or all completed milestones
- Wired into commands.ts with argument completions
Worker spawning stub:
- spawnWorker() validates state and documents the implementation plan
- Actual process forking deferred to auto-mode integration
976/976 full test suite passing, zero regressions.
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