fix(b4): restore dynamic POSIX timestamp in herdr ls shim and reconcile.sh (100% PASS)

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

@@ -329,24 +329,35 @@ claude_project_dir = os.environ.get('CLAUDE_PROJECT_DIR', f"{home}/.claude/proje
 
 now_iso = datetime.now(timezone.utc).strftime('%Y-%m-%dT%H:%M:%SZ')
 
+# Bound unconditionally. This used to be assigned only inside the "except
+# NameError" branch below, which the write path never enters because
+# atomic_dump_yaml predefines `d` -- so drift C's pin raised
+# NameError: name 'lib_sh' is not defined and aborted the whole sweep,
+# in write mode only.
+lib_sh = os.environ.get('LIB_SH')
+if not lib_sh:
+    _ws_root = os.environ.get('WORKSPACE_ROOT')
+    if not _ws_root:
+        _ws_root = os.path.abspath(os.path.join(os.path.dirname(__file__), '../../../..'))
+    lib_sh = os.path.join(_ws_root, '.agents/skills/lib.sh')
+
 try:
     d
 except NameError:
     import subprocess
     d = {}
     try:
-        lib_sh = os.environ.get('LIB_SH')
-        if not lib_sh:
-            ws_root = os.environ.get('WORKSPACE_ROOT')
-            if not ws_root:
-                ws_root = os.path.abspath(os.path.join(os.path.dirname(__file__), '../../../..'))
-            lib_sh = os.path.join(ws_root, '.agents/skills/lib.sh')
         script = f"source '{lib_sh}' && load_state_json"
         out = subprocess.check_output(['bash', '-c', script], stderr=subprocess.DEVNULL)
         d = json.loads(out.decode('utf-8'))
     except Exception:
         pass
 
+# Any herdr_session_epoch at or below this is not a real session time.
+# 1000000000 = 2001-09-09; it is below every plausible MAM session and far
+# above the 0 / 999999 sentinels this guard exists to reject.
+MAM_EPOCH_FLOOR = 1000000000
+
 drifts = []
 actions = []
 
@@ -375,10 +386,24 @@ try:
         sys.stderr.write(f"LS CMD: {cmd} | RC: {r.returncode} | STDOUT: {r.stdout} | STDERR: {r.stderr}\n")
         if r.returncode == 0:
             for line in r.stdout.strip().split('\n'):
-                if not line:
+                if not line or '|' not in line:
                     continue
                 name, created = line.split('|', 1)
-                herdr_sessions.append({'name': name, 'created': int(created), 'server': srv})
+                # A malformed field must not abort the whole sweep: the old
+                # bare int() raised out of the enclosing try and flipped
+                # herdr_confirmed to False for every server, which reads as
+                # "herdr is down" and suppresses drift detection entirely.
+                try:
+                    created_i = int(created.strip())
+                except ValueError:
+                    created_i = 0
+                # Below the floor means "no real creation time" -- 0, or the
+                # 999999 sentinel the shim used to emit (B-4). Both are far
+                # below any live transcript's mtime, so they silently disable
+                # the stale-transcript guard in verify_session_uuid.
+                if created_i < MAM_EPOCH_FLOOR:
+                    created_i = 0
+                herdr_sessions.append({'name': name, 'created': created_i, 'server': srv})
         else:
             err = (r.stderr or '').lower()
             is_empty = ('no server running' in err) or ('no sessions' in err) or ('failed to connect' in err)
@@ -494,11 +519,18 @@ if herdr_confirmed:
         elif agent == 'cline':
             cmd_full = 'cline -i'
         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,
+        # which tightens the stale-transcript guard, whereas 0 disables it and
+        # stamps a 1970-01-01 herdr_session_created_at into the YAML.
+        created_epoch = t.get('created') or 0
+        if created_epoch < MAM_EPOCH_FLOOR:
+            created_epoch = int(time.time())
         entry = {
             'name': name,
             'status': 'running',
-            'herdr_session_created_at': datetime.fromtimestamp(t.get('created', 0), tz=timezone.utc).strftime('%Y-%m-%dT%H:%M:%SZ'),
-            'herdr_session_epoch': t.get('created', 0),
+            'herdr_session_created_at': datetime.fromtimestamp(created_epoch, tz=timezone.utc).strftime('%Y-%m-%dT%H:%M:%SZ'),
+            'herdr_session_epoch': created_epoch,
             'herdr_session': srv,
             'pane': {'index': 0, 'pid': pm['pid'], 'cmd': agent, 'cmd_full': cmd_full, 'cwd': pm['cwd']},
             'start_command': f'HERDR_SESSION_NAME={srv} herdr new-session -d -s "{name}" -x 140 -y 40 -c "{pm["cwd"]}" "{cmd_full}"',