merge: integrate remote MQTT routing with seat-scoped dynamic modes

src/cognitive_agent/application/mode_profile.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 import hashlib
 import json
 import re
+from collections.abc import Callable
 from dataclasses import dataclass
 from pathlib import Path
 from threading import RLock
@@ -533,6 +534,7 @@ class ModeProfileRegistry:
         self.user_root = Path(user_root) if user_root is not None else self.profile_root
         self.session_user_profiles = user_root is not None
         self._profiles: list[ModeProfile] = []
+        self._change_listeners: list[Callable[["ModeProfileRegistry"], None]] = []
         self._write_lock = RLock()
         self.reload()
 
@@ -555,6 +557,30 @@ class ModeProfileRegistry:
                     if path.is_file()
                 )
             self._profiles = profiles
+            self._notify_change_listeners()
+
+    def add_change_listener(
+        self,
+        listener: Callable[["ModeProfileRegistry"], None],
+        *,
+        notify: bool = True,
+    ) -> None:
+        """Run ``listener`` after every successful registry reload.
+
+        Mode profiles remain YAML-backed.  Listeners are intended for derived,
+        read-only projections such as the LAN scene catalog; they do not replace
+        or alter the existing persistence path.
+        """
+
+        with self._write_lock:
+            if listener not in self._change_listeners:
+                self._change_listeners.append(listener)
+            if notify:
+                listener(self)
+
+    def _notify_change_listeners(self) -> None:
+        for listener in tuple(self._change_listeners):
+            listener(self)
 
     def profiles(self) -> list[ModeProfile]:
         return list(self._profiles)