before-Temporal gate: the kill must reproduce the failure

  PASS  the agent outlived the coordinator that launched it
        agent processes alive after the kill = 1
  PASS  failure 1: the restart launched a second agent for the same work item
        sessions created = ['work-item-1-g1', 'work-item-1-g2']
  PASS  failure 1: both agents were alive at the same time
        most agent processes observed at once = 2
  PASS  failure 1: both sessions edited the same worktree file
        distinct sessions in the worktree = 2
  PASS  failure 2: the final receipt is a stale generation's
        receipt generation = 1, current claim generation = 2
  PASS  failure 2: the recovery scan wrote it, not the current procedure
        recorded by = 'recovery-scan'
  PASS  failure 2: the store history shows the overwrite explicitly
        overwrite events = 1

Reproduced: one kill, two agents for one task, and the current
receipt overwritten by a stale generation. This is the before-world.