feat(a4,c3b): complete A-4 Phase 2 agent knowledge migration & Option B isolation removal

- Option B / C-3b: Deprecate isolation.root and remove its 4 legacy consumers in lib.sh, workspace_uuid.py, verify_session.py, and stop_session.sh.
- M2~M7 Migration: Implement artifact_path, verify_artifact, purge_artifacts, spawn_spec, resume_spec, auth_ok, discover, ready_tokens, exit_key, and delegate_agent_key across BaseAgentAdapter and all 4 adapters (Claude, Agy, Hermes, Cline).
- Migrate shell duplications in lib.sh, create_session.sh, resume_session.sh, stop_session.sh, and reconcile.sh to python -m lib_py.agents facts.
- Hardening & Corrections: Fix Cline resume_spec flag to '-i --id', apply shlex.quote across all facts variables with MAM_ prefix, add safe fallback in wait_for_tui_ready.
- Add comprehensive contract tests in tests/test_a4_adapter_contract.py and sync IMPROVEMENTS.md / LOG.md.
- Verified: 100% PASS across unit, component, contract, and integration tests.

LOG.md

@@ -6,9 +6,25 @@
 
 ---
 
-## 📌 1. 금일 작업 내용 요약
+### 1) **P3-1 (A-4 Phase 2 / Option B / C-3b / M2~M7): 에이전트 지식 계층 마이그레이션 및 isolation.root 완전 폐기** — **완료**
+- **배경**: 에이전트별 아티팩트 경로, 검증 로직, 재개/시작 스펙, 토큰, 종료 키, 인증(`auth_ok`), 자동 발견(`discover`)이 스크립트 전반에 하드코딩 산재되어 있던 문제(A-4)와, Universal Global Config 전환 후에도 4개 지점에 남아있던 `isolation.root` 소비자(C-3b)를 완전 폐기하고 어댑터 단일 소스로 일원화.
+- **주요 구현**:
+  - [`.agents/skills/lib_py/agents/base.py`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/lib_py/agents/base.py): `DiscoveryContext` 확장 (`ws_key`, `cwd`, `home_dir`, `claude_dir`, `epoch`, `row`, `mode`), `BaseAgentAdapter` 추상 인터페이스 정의 (`ready_tokens`, `exit_key`, `delegate_agent_key`, `identity_cache_fields`, `artifact_path`, `verify_artifact`, `purge_artifacts`, `spawn_spec`, `resume_spec`, `auth_ok`, `discover`).
+  - [`.agents/skills/lib_py/agents/adapters/`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/lib_py/agents/adapters/): `claude.py`, `agy.py`, `hermes.py`, `cline.py` 4개 어댑터 구체 클래스 구현 (Cline `resume_spec` `-i --id` 수정 반영, `auth_ok`, `discover` 구현).
+  - [`.agents/skills/lib_py/agents/__main__.py`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/lib_py/agents/__main__.py): 8개 `MAM_*` 변수 `shlex.quote` 셸 브리지 완성.
+  - [`.agents/skills/lib_py/verify_session.py`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/lib_py/verify_session.py): `adapter.verify_artifact(uuid, ctx)` 위임 및 `iso_root` 분기 제거.
+  - [`.agents/skills/lib_py/workspace_uuid.py`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/lib_py/workspace_uuid.py): `iso_root_of` 제거 및 디스크 스캔을 `adapter.discover(ctx)`로 단일화.
+  - [`.agents/skills/lib_py/atomic_yaml.py`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/lib_py/atomic_yaml.py): 레거시 `isolation` 유효성 검사 절 제거.
+  - [`.agents/skills/lib.sh`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/lib.sh): `mam_session_iso_root` 제거, `wait_for_tui_ready` 셀프 컨테인드 토큰 폴백 및 claude `projects` 토큰 제거.
+  - [`.agents/skills/multi-agent-mux-create/scripts/create_session.sh`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/multi-agent-mux-create/scripts/create_session.sh): `CMD_FULL` (어댑터 `spawn_spec`) 및 `delegate_agent` (`delegate_agent_key`) 이관.
+  - [`.agents/skills/multi-agent-mux-resume/scripts/resume_session.sh`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/multi-agent-mux-resume/scripts/resume_session.sh): `_iso_root` 분기 완전 제거 및 `CMD_FULL` 을 `adapter.resume_spec`으로 이관.
+  - [`.agents/skills/multi-agent-mux-monitor/scripts/reconcile.sh`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/multi-agent-mux-monitor/scripts/reconcile.sh): `row_agent` / `_pin_and_verify_resume` / `OWN_KEY_BY_AGENT` / auto-register `cmd_full` 을 어댑터 레이어로 이관.
+  - [`.agents/skills/multi-agent-mux-stop/scripts/stop_session.sh`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/multi-agent-mux-stop/scripts/stop_session.sh): `exitkey` (`adapter.exit_key`), `adapter.purge_artifacts`, `adapter.identity_cache_fields` 위임 및 레거시 격리 삭제 블록 제거.
+  - [`tests/test_a4_adapter_contract.py`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/tests/test_a4_adapter_contract.py): facts eval 계약, 어댑터 속성 계약, 복합 아티팩트 삭제(purge_artifacts), spawn/resume_spec 계약, auth_ok 계약, discover 계약 테스트 9종 추가.
+  - [`IMPROVEMENTS.md`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/IMPROVEMENTS.md): A-4 및 C-3b 완료 처리 및 19개 과제 완결 상태 동기화.
+- **검증**: `pytest` 실행 결과 **259 passed in 493s (100%)**.
 
-### 1) **P2-2 (C-3a / C-4): 레거시 격리 스텁 및 미사용 심볼 제거** — **완료**
+### 2) **P2-2 (C-3a / C-4): 레거시 격리 스텁 및 미사용 심볼 제거** — **완료**
 - **배경**: 격리 구조가 Universal Global Config(Job `536a6625`)로 전환되며 남은 빈 스텁 4종과, 그 빈 출력만 재확인하던 공허한 테스트 4건, 그리고 참조 0회 심볼 3종 정리.
 - **주요 구현**:
   - [`.agents/skills/lib.sh`](file:///Users/godopu16/PuKi/laa/canary_projects/multi-agent-mux/.agents/skills/lib.sh): 빈 스텁 4종(`provision_isolation`, `isolation_lever`, `isolation_env_prefix`, `isolation_cmd_args`) 및 `_REAL_HERDR_PATH` 대입·export 제거, 주석에 C-3b 경계 명시.