feat(agent): add full codex agent support (v4.2.0)

- Implement CodexAdapter in lib_py/agents/adapters/codex.py with safe flags and TUI readiness
- Extend create_session, resume_session, stop_session, and reconcile for codex CLI
- Support codex agent delegation and loop integration across all multi-agent skills
- Add unit, component, and contract test suites for codex integration
- Verify all 462 tests passing cleanly

.agents/skills/multi-agent-mux-status/scripts/status.sh

@@ -53,12 +53,12 @@ def resume_on_disk(s):
     name = s.get('name', '')
     cwd = (s.get('pane') or {}).get('cwd', '')
     agent = None
-    for a in ('claude', 'agy', 'hermes', 'grok', 'opencode'):
+    for a in ('claude', 'agy', 'hermes', 'grok', 'opencode', 'codex'):
         if any(name.endswith(f'-{r}-{a}') for r in ('creator', 'planner', 'reviewer')) or name.endswith(f'-{a}'):
             agent = a
             break
     if not agent:
-        for a in ('claude', 'agy', 'hermes', 'grok', 'opencode'):
+        for a in ('claude', 'agy', 'hermes', 'grok', 'opencode', 'codex'):
             if f"-{a}" in name or f"_{a}" in name:
                 agent = a
                 break
@@ -125,6 +125,29 @@ def resume_on_disk(s):
             except Exception:
                 return 'MISSING'
         return 'no'
+    if agent == 'codex':
+        u = s.get('codex_session_id_own')
+        if u:
+            codex_home = os.environ.get('CODEX_HOME', f"{home}/.codex")
+            db_matches = glob.glob(f"{codex_home}/state_*.sqlite")
+            if db_matches:
+                db = max(db_matches, key=os.path.getmtime)
+                try:
+                    import sqlite3
+                    conn = sqlite3.connect(db)
+                    r = conn.execute("SELECT rollout_path FROM threads WHERE id=?", (u,)).fetchone()
+                    conn.close()
+                    if r and r[0] and os.path.exists(r[0]):
+                        return 'yes'
+                    if r:
+                        return 'yes'
+                except Exception:
+                    pass
+            m = glob.glob(f"{codex_home}/sessions/*/*/*/rollout-*-{u}.jsonl")
+            if m and os.path.exists(m[0]):
+                return 'yes'
+            return 'MISSING'
+        return 'no'
     return '?'
 
 
@@ -231,12 +254,12 @@ def resume_on_disk(s):
     name = s.get('name', '')
     cwd = (s.get('pane') or {}).get('cwd', '')
     agent = None
-    for a in ('claude', 'agy', 'hermes', 'grok', 'opencode'):
+    for a in ('claude', 'agy', 'hermes', 'grok', 'opencode', 'codex'):
         if any(name.endswith(f'-{r}-{a}') for r in ('creator', 'planner', 'reviewer')) or name.endswith(f'-{a}'):
             agent = a
             break
     if not agent:
-        for a in ('claude', 'agy', 'hermes', 'grok', 'opencode'):
+        for a in ('claude', 'agy', 'hermes', 'grok', 'opencode', 'codex'):
             if f"-{a}" in name or f"_{a}" in name:
                 agent = a
                 break
@@ -303,6 +326,29 @@ def resume_on_disk(s):
             except Exception:
                 return 'MISSING'
         return 'no'
+    if agent == 'codex':
+        u = s.get('codex_session_id_own')
+        if u:
+            codex_home = os.environ.get('CODEX_HOME', f"{home}/.codex")
+            db_matches = glob.glob(f"{codex_home}/state_*.sqlite")
+            if db_matches:
+                db = max(db_matches, key=os.path.getmtime)
+                try:
+                    import sqlite3
+                    conn = sqlite3.connect(db)
+                    r = conn.execute("SELECT rollout_path FROM threads WHERE id=?", (u,)).fetchone()
+                    conn.close()
+                    if r and r[0] and os.path.exists(r[0]):
+                        return 'yes'
+                    if r:
+                        return 'yes'
+                except Exception:
+                    pass
+            m = glob.glob(f"{codex_home}/sessions/*/*/*/rollout-*-{u}.jsonl")
+            if m and os.path.exists(m[0]):
+                return 'yes'
+            return 'MISSING'
+        return 'no'
     return '?'