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.

.agents/skills/multi-agent-mux-monitor/scripts/reconcile.sh

@@ -433,14 +433,12 @@ def pane_meta(session, srv):
         return None
 
 
+from lib_py.agents.registry import get_adapter, own_key as _get_own_key, agent_of_row
+
 def _pin_and_verify_resume(s, agent, cwd, uuid, degraded=False):
-    own_key = {
-        'claude': 'claude_session_id_own',
-        'agy': 'agy_conversation_id_own',
-        'hermes': 'hermes_conversation_id_own',
-        'cline': 'cline_conversation_id_own'
-    }[agent]
-    s[own_key] = uuid
+    own_key_field = _get_own_key(agent)
+    if own_key_field:
+        s[own_key_field] = uuid
     s['last_visible_status'] = 'pinned'
     resume_cmd = ['bash', os.path.join(skills_dir, 'multi-agent-mux-resume', 'scripts', 'resume_session.sh'),
                   '--workspace', cwd, '--agent', agent, '--session', s['name'], '--dry-run']
@@ -539,14 +537,8 @@ if herdr_confirmed:
         ws_root_abs = os.path.realpath(workspace_root)
         if not pane_cwd_abs or not (pane_cwd_abs == ws_root_abs or pane_cwd_abs.startswith(ws_root_abs + os.sep)):
             continue
-        if agent == 'claude':
-            cmd_full = 'claude --dangerously-skip-permissions'
-        elif agent == 'agy':
-            cmd_full = 'agy --dangerously-skip-permissions'
-        elif agent == 'hermes':
-            cmd_full = 'hermes'
-        elif agent == 'cline':
-            cmd_full = 'cline -i'
+        _adapter = get_adapter(agent)
+        cmd_full = _adapter.spawn_spec(agent) if _adapter else agent
         server_opt = f"-L {srv} " if srv != 'default' else ""
         # The shim resolves this from the pane's root process. Fall back to now
         # only if that failed: 'now' can merely over-estimate creation time,
@@ -596,24 +588,10 @@ if herdr_confirmed:
         actions.append(f"registered: {name}")
 
 def row_agent(s):
-    cmd = ((s.get('pane') or {}).get('cmd') or '').strip()
-    if cmd in ('claude', 'agy', 'hermes', 'cline'):
-        return cmd
-    full = ((s.get('pane') or {}).get('cmd_full') or '')
-    for a in ('claude', 'agy', 'hermes', 'cline'):
-        if a in full:
-            return a
-    name = s.get('name', '')
-    for a in ('claude', 'agy', 'hermes', 'cline'):
-        if name.endswith('-creator-' + a):
-            return a
-    return None
+    return agent_of_row(s)
 
 OWN_KEY_BY_AGENT = {
-    'claude': 'claude_session_id_own',
-    'agy': 'agy_conversation_id_own',
-    'hermes': 'hermes_conversation_id_own',
-    'cline': 'cline_conversation_id_own'
+    a: _get_own_key(a) for a in ('claude', 'agy', 'hermes', 'cline')
 }
 
 # === drift C0: 지정된 ID 는 발견이 아니라 '확인'만 필요하다 ===