Retained directories on queued, paused, blocked, or terminal tasks no longer
consume scheduler slots. Agent concurrency and worktree capacity now count the
same canonical live-task population through one project admission ceiling
(resolveActiveTaskCapacityLimit) with an atomic reserveIfAvailable claim, so
planning, execute, and merge lanes cannot each observe and claim the final
worktree slot independently.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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