Two related bugs let two in-progress tasks share a single
.worktrees/<name> directory:
1. The dashboard POST /tasks/:id/move route promoted tasks to
in-progress without allocating a fresh worktree path, so a queued
task carrying a stale worktree field from a prior preserveResumeState
requeue could land in-progress on a directory already held by another
active task.
2. moveTask({preserveResumeState:true}) kept the worktree pointer on
requeue. When the on-disk checkout was later removed or reassigned,
the next dispatch collided with a worktree the scheduler had handed
to another task.
moveTask now releases the worktree pointer on every reopen-to-todo hop
(branch is kept so committed progress survives via git worktree add
<path> <branch>). A new preserveWorktree option opts internal bounces
out of the release. moveTask also accepts an allocateWorktree callback
that runs under a new cross-task allocation lock in TaskStore, so two
concurrent moves cannot pick the same name from a stale snapshot. Both
the manual-move route and the scheduler dispatch path flow through the
allocator and share the lock.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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