fix(monitor,resume): honor stopped status + clear stop metadata on resume

Implements user choice Option B: the two follow-ups to 0de0f23, in one patch.

Changes:
- skills/tmux-agent-orchestrate-monitor/scripts/reconcile.sh:
  - drift-A skip-set extended: ('terminated', 'archived', 'stopped')
  - prevents the monitor from overwriting a tmux-dead 'stopped' row with
    'terminated (auto-detected)', which would lose resumable + captured id
- skills/tmux-agent-orchestrate-resume/scripts/update_yaml_resumed.sh:
  - pop stopped_at, stopped_at_epoch, stop_reason, resumable on resume
    (alongside the existing terminated_at*/termination_mode/archived_at) so a
    resumed row has no stale end-of-session metadata
- skills/tmux-agent-orchestrate-monitor/SKILL.md: documented 'stopped' in the
  drift class list + a skip-set note on drift class A
- skills/tmux-agent-orchestrate-resume/SKILL.md: documented stopped -> running
  transition + tier-1 race-free resume path

5-route surface preserved (no new directory). delete_session.sh untouched.

Verified on isolated server -L claude-followup-test (kill-server after):
- syntax PASS
- E2E A: stop -> tmux dead -> reconcile --once -> status stays 'stopped'
- E2E B: resume -> stopped_at/stopped_at_epoch/stop_reason/resumable all gone
- E2E C: plain delete -> terminated, reconcile leaves it (no regression)
- Real YAML + main canary untouched

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

skills/tmux-agent-orchestrate-resume/scripts/update_yaml_resumed.sh

@@ -92,6 +92,11 @@ target.pop('terminated_at', None)
 target.pop('terminated_at_epoch', None)
 target.pop('termination_mode', None)
 target.pop('archived_at', None)
+# stop 메타도 정리 — resume 하면 더 이상 stopped 상태가 아니므로 잔존 필드를 제거.
+target.pop('stopped_at', None)
+target.pop('stopped_at_epoch', None)
+target.pop('stop_reason', None)
+target.pop('resumable', None)
 target['last_visible_status'] = f'resumed conversation {uuid} at {now}'
 
 target.setdefault('pane', {})