feat(xxm): dynamic TUI session context injection for coregroup

- chat_bridge: mark_active_tui_session() + get_active_tui_session()
  Tracks active TUI session via temp/.active_tui_session.json,
  auto-expires after 1 hour (matching Hermes state_meta pattern)
- chat_bridge: inject TUI context when processing coregroup messages
  Bot now sees what hmo was discussing in TUI when replying in group
- session_router: record active session ID on every TUI message
  Uses _resolve_session() to get the current bound session ID

gateway/scripts/session_router.py

@@ -620,5 +620,16 @@ class SessionRouter:
         tagged = f"{prefix}{message}"
         history = [{"role": "user", "content": tagged}]
 
+        # Dynamic context switching: record active TUI session
+        # so bot can inject TUI context when replying to coregroup
+        if channel != "xmpp":
+            try:
+                sid = self._resolve_session(key, allow_create=False)
+                if sid:
+                    from chat_bridge import mark_active_tui_session
+                    mark_active_tui_session(sid)
+            except Exception:
+                pass
+
         # 4. Run LLM command loop
         return self._llm_loop(key, history)