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Multi-Run Coordination

Lock ordering is scope first, run second.

Rules:

  1. Compute the workspace scope from the git root or DEADRECKON_SCOPE_ROOT.
  2. Acquire the scope/task lock at /Users/gdc/.deadreckon/locks/<scope>--<task>.lock.
  3. Only after the scope lock is held, mutate files under runstate/<scope>/runs/<run-id>/.
  4. Never acquire locks in the reverse order.
  5. Release is idempotent; stale lock reclaim uses heartbeat age plus PID liveness.

Different scopes may run the same task key concurrently. A second run in the same scope/task is refused with the first run id and phase so the operator can attach, kill, or resume the owner.