feat(o3): implement Invocation-Aware Scoped Guard for orchestrator role scoping (100% PASS)

.agents/skills/multi-agent-mux-loop/SKILL.md

@@ -18,6 +18,7 @@ metadata:
 
 > **Companion skills**: `multi-agent-mux-create` (start), `multi-agent-mux-resume` (re-attach), `multi-agent-mux-delegate-job` (delegate).
 > **Safety Guard**: `--max-loop`, `--max-rebut`, and `--plan-talk` restrict API cost runaways.
+> **Scope Guard (O-3)**: Intercepts direct orchestrator mutations when `/multi-agent-mux-loop` is active. See [.agents/MULTI_AGENT_RULES.md #3.2](.agents/MULTI_AGENT_RULES.md#32-invocation-aware-scoped-guard-o-3).
 > **Single source of truth**: `./.mam/agent-sessions.yaml`.
 
 수동 템플릿 작성 및 수동 프롬프트 환류는 폐지되었습니다. Planner, Creator, Reviewer 간의 모든 협업 피드백 루프는 본 스킬(`run_loop.sh`)만을 단독으로 사용하여 자동으로 오케스트레이션합니다.

.agents/skills/multi-agent-mux-loop/scripts/run_loop.sh

@@ -79,6 +79,15 @@ if [ -z "$TARGET_AGENT" ] || [ -z "$TASK" ]; then
   echo "ERROR: --target-agent and --task are mandatory fields."
   usage
 fi
+
+MAM_LOOP_MARKER="$REPO_ROOT/.mam/loop-guard-active"
+mkdir -p "$(dirname "$MAM_LOOP_MARKER")"
+_mam_lstart() { ps -p "$1" -o lstart= 2>/dev/null | tr -s ' ' | sed 's/^ *//;s/ *$//'; }
+printf 'pid=%s\nlstart=%s\nstarted=%s\n' \
+  "$$" "$(_mam_lstart $$)" "$(date -u +%Y-%m-%dT%H:%M:%SZ)" > "$MAM_LOOP_MARKER"
+_mam_release_guard() { rm -f "$MAM_LOOP_MARKER"; }
+trap _mam_release_guard EXIT INT TERM HUP
+
 delegate_job_safe() {
   local orig_script="$REPO_ROOT/.agents/skills/multi-agent-mux-delegate-job/multi-agent-mux-delegate-job"
   local tmp_script
@@ -88,7 +97,7 @@ delegate_job_safe() {
   local rc=0
   bash "$tmp_script" "$@" || rc=$?
   rm -f "$tmp_script"
-  trap - EXIT INT TERM HUP
+  trap _mam_release_guard EXIT INT TERM HUP
   return $rc
 }