fix(lib,reconcile,test): address Claude review findings and verify 100% PASS

- lib.sh: distinguish unobservable/headless (rc=2) from unsettled panes in _pane_quiescent; restore 10s quiescence window with early giveup (SKS_EMPTY_GIVEUP)
- reconcile.sh: fix SKILLS_DIR command substitution logic (&& pwd instead of || pwd)
- tests/test_b19_headless_reconcile_fixes.py: implement mutation-proven regression tests for headless prompt bypass, slow-settling panes with persistent counters, and real reconcile.sh SKILLS_DIR evaluation
- deploy/ & IMPROVEMENTS.md: document nats submodule access notes and B-19/B-20 evolution
- Promoted Reviewer Claude's final 100% PASS report (report-119b9f57.md)

deploy/INSTALL.md

@@ -130,7 +130,7 @@ $ bash .agents/skills/multi-agent-mux-orc-onboard/scripts/orc_onboard.sh --remov
 ### 7) 전용 NATS 메시징 브로커 설정 (.mam.env)
 MAM은 비동기 작업 위임(`multi-agent-mux-delegate-job`) 및 이벤트 스트림 중계를 위해 MQTT 3.1.1 및 JetStream 기반의 사설 NATS 브로커(`nats-docker`)를 표준으로 지원합니다.
 *   **환경 설정 생성**: `bash deploy/generate-env.sh` (또는 `cp .mam.env.example .mam.env`)를 실행하여 로컬 `.mam.env`를 생성합니다.
-*   **서브모듈 동기화**: `git submodule update --init --recursive` 명령어로 `nats-docker/` 배포 자산을 초기화합니다.
+*   **서브모듈 동기화**: `git submodule update --init --recursive` 명령어로 `nats-docker/` 배포 자산을 초기화합니다. (사내 비공개 저장소 `laa/nats-docker` 접근 권한이 없는 경우 서브모듈 동기화를 생략해도 표준 MQTT 브로커를 통해 기본 프레임워크 기능이 완비됩니다.)
 *   **사설 서버 배포 가이드**: 자세한 도커 배포 및 Tailscale 연동 절차는 [`nats-docker/PRIVATE_SERVER.md`](../nats-docker/PRIVATE_SERVER.md) 및 [`MESSAGING.md`](../MESSAGING.md)를 참조하십시오.
 
 ---

deploy/README.md

@@ -72,13 +72,16 @@ To register these skills globally or for a specific workspace:
 For production deployments and private networks, MAM utilizes a dedicated NATS broker (`nats:2.12-alpine` with MQTT 3.1.1 and JetStream enabled). The container assets and deployment guides are managed in the `nats-docker` submodule:
 
 ```bash
-# When cloning the repository, initialize submodules:
+# When cloning the repository with internal credentials:
 git clone --recurse-submodules https://git.godopu.com/tmpl/multi-agent-mux.git
 
 # Or initialize submodules in an existing clone:
 git submodule update --init --recursive
 ```
 
+> [!NOTE]
+> `nats-docker` is an optional submodule hosted in the private repository `laa/nats-docker`. If cloning without internal credentials, omit `--recurse-submodules`. The MAM framework functions out-of-the-box using standard MQTT brokers configured in `.mam.env`.
+
 Refer to [`nats-docker/PRIVATE_SERVER.md`](../nats-docker/PRIVATE_SERVER.md) and [`MESSAGING.md`](../MESSAGING.md) for detailed configuration, `.mam.env` generation, and security guidelines.
 
 ---