fix: periodic register reload in approval scanner + direct project_name access

bot.py

@@ -322,8 +322,11 @@ class GravityBot(commands.Bot):
 
     @tasks.loop(seconds=3)
     async def pending_approval_scanner(self):
-        """Scan bridge/pending/ for new approval requests."""
+        """Scan bridge/pending/ for new approval requests + reload registrations."""
         try:
+            # Reload conv→project registrations each cycle
+            self._load_registrations()
+
             requests = self.bridge.get_pending_requests()
             for req in requests:
                 if req.request_id in self._sent_approval_ids:
@@ -332,7 +335,7 @@ class GravityBot(commands.Bot):
                     continue
 
                 # Learn project mapping from pending approval
-                project = getattr(req, 'project_name', '') or Config.PROJECT_NAME
+                project = req.project_name or Config.PROJECT_NAME
                 if req.conversation_id and req.conversation_id != '__global__':
                     self.conv_to_project[req.conversation_id] = project