initial: canary multi-agent skills with tmux isolation support

- lib.sh: TMUX_SERVER_NAME env var, _tmux helper, shim externalized
  to TMPDIR with recursive guard, resolve_tmux_server helper for
  YAML-driven server routing
- multi-agent-create: --tmux-server opt-in flag, YAML tmux_server
  field for orphan prevention
- multi-agent-delete/resume/status/agent-sessions-monitor: use
  resolve_tmux_server to auto-route to correct isolated server
- SKILL.md × 4: documented isolation server workflow
- Verified by claude review (R1+re-run) + agy R2 patches
  (orphan prevention + shim location fix)

skills/multi-agent-resume/scripts/update_yaml_resumed.sh

@@ -0,0 +1,106 @@
+#!/usr/bin/env bash
+# update_yaml_resumed.sh — multi-agent-resume 의 부속 스크립트
+# Resume 한 세션의 agent-sessions.yaml 엔트리를 status=running + resume 메타로 갱신.
+# resume UUID 를 per-row own id (claude_session_id_own / agy_conversation_id_own)
+# 에 박는다 — agent_identities 전역은 더 이상 primary 아님 (cache 로 강등, P0-C/단계 e).
+#
+# Usage: bash update_yaml_resumed.sh --session <name> --uuid <id> [--agent claude|agy]
+set -euo pipefail
+
+source "$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)/lib.sh"
+
+usage() {
+  cat <<EOF
+Usage: $0 --session <name> --uuid <id> [--agent claude|agy]
+EOF
+}
+
+SESSION_NAME=""
+UUID=""
+AGENT=""
+
+while [ $# -gt 0 ]; do
+  case "$1" in
+    --session) SESSION_NAME="$2"; shift 2 ;;
+    --uuid)    UUID="$2";          shift 2 ;;
+    --agent)   AGENT="$2";         shift 2 ;;
+    -h|--help) usage; exit 0 ;;
+    *) echo "ERROR: unknown arg: $1" >&2; exit 2 ;;
+  esac
+done
+
+[ -n "$SESSION_NAME" ] || { echo "ERROR: --session required" >&2; exit 2; }
+[ -n "$UUID" ]        || { echo "ERROR: --uuid required" >&2; exit 2; }
+[ -f "$AGENT_SESSIONS_YAML" ] || { echo "ERROR: $AGENT_SESSIONS_YAML not found" >&2; exit 1; }
+
+export TMUX_SERVER_NAME="$(resolve_tmux_server "$SESSION_NAME")"
+
+# --agent 미지정 시 이름 suffix 로 fallback (P1-F: 가능하면 --agent 명시)
+if [ -z "$AGENT" ]; then
+  case "$SESSION_NAME" in
+    *-creator-claude) AGENT=claude ;;
+    *-creator-agy)    AGENT=agy ;;
+    *) echo "ERROR: cannot infer agent from '$SESSION_NAME'; pass --agent" >&2; exit 2 ;;
+  esac
+fi
+
+NOW_ISO=$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+
+# 새 tmux pane pid / 자식 pid 를 bash 에서 캡처 (env 로 전달, P1-B)
+PANE_PID=$(tmux list-panes -t "$SESSION_NAME" -F '#{pane_pid}' 2>/dev/null | head -1 || true)
+PANE_PID="${PANE_PID:-}"
+CHILD_PID=0
+if [ "$AGENT" = "agy" ] && [ -n "$PANE_PID" ]; then
+  CHILD_PID=$(pgrep -P "$PANE_PID" -x agy 2>/dev/null | head -1 || true)
+  CHILD_PID="${CHILD_PID:-0}"
+fi
+
+atomic_dump_yaml "$AGENT_SESSIONS_YAML" \
+  SESSION_NAME="$SESSION_NAME" UUID="$UUID" AGENT="$AGENT" NOW_ISO="$NOW_ISO" \
+  PANE_PID="$PANE_PID" CHILD_PID="$CHILD_PID" <<'PYEOF'
+name = os.environ['SESSION_NAME']
+uuid = os.environ['UUID']
+agent = os.environ['AGENT']
+now = os.environ['NOW_ISO']
+pane_pid = os.environ.get('PANE_PID', '')
+
+target = None
+for s in d.get('tmux_sessions', []):
+    if s.get('name') == name:
+        target = s
+        break
+
+if target is None:
+    print(f"ERROR: session not in YAML: {name}", flush=True)
+    raise SystemExit(1)
+
+target['status'] = 'running'
+target.pop('terminated_at', None)
+target.pop('terminated_at_epoch', None)
+target.pop('termination_mode', None)
+target.pop('archived_at', None)
+target['last_visible_status'] = f'resumed conversation {uuid} at {now}'
+
+target.setdefault('pane', {})
+if pane_pid.isdigit():
+    target['pane']['pid'] = int(pane_pid)
+
+if agent == 'claude':
+    target['pane']['cmd'] = 'claude'
+    target['pane']['cmd_full'] = f'claude --dangerously-skip-permissions -r {uuid}'
+    target['claude_session_id_own'] = uuid
+elif agent == 'agy':
+    target['pane']['cmd'] = 'agy'
+    target['pane']['cmd_full'] = f'agy --dangerously-skip-permissions --conversation {uuid}'
+    target['agy_conversation_id_own'] = uuid
+    cp = os.environ.get('CHILD_PID', '0')
+    if cp.isdigit() and int(cp) > 0:
+        target['child_pid'] = int(cp)
+
+snap = d.setdefault('snapshot', {})
+snap['taken_at'] = now
+snap.pop('terminated_at', None)
+snap.pop('terminated_at_epoch', None)
+
+print(f"updated: {name} status=running (resume id -> per-row own id)", flush=True)
+PYEOF