A create/resume killed after spawning its pane but before registering its
row left a marker whose owner pid was dead; the next same-cwd waiter pruned
it on the pid alone and could start a second session that discovers the
same workspace conversation id (PR #69 review P1).
- Markers record the herdr server. A dead owner's marker is pruned only once
its row is registered for the attempt (running, newer epoch: the row
decides) or `_herdr has-session` reports the session gone; an unanswered
probe counts as alive. On timeout the kill-session command is printed.
- A live marker of another process for the waiter's own session name is kept
and blocks instead of being deleted; the waiter's own pid's markers go.
- Tests: orphan / registered / gone / same-session / missing pane pid cases,
and a create-level reproduction against mock herdr (fails before the fix).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
GodopuandClaude Opus 5.5
ede9c62be3