Add 60-second grace period to stale in-progress detection in dev-poll.sh.
When a poller sees an in-progress issue with no assignee/PR/lock, it now
checks the timeline API for when the label was added. If <60s ago, it
skips stale detection to allow the claiming agent time to finish its
assign+label sequence.
Also documents the intentional assign-before-label ordering in
issue_claim() that minimizes the race window.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Remove ensure_blocked_label_id() from ci-helpers.sh; _ilc_ensure_label_id()
in issue-lifecycle.sh is the canonical, general implementation. Update the
stale comment that referenced the removed function.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
