perf(collector/watcher): 로컬 데이터 전송 성능 최적화 — mtime 프리체크, 프로젝트 캐시, re-forward 수정, 폴링 간격 조정

watcher.py

@@ -77,6 +77,27 @@ class BrainEventHandler(FileSystemEventHandler):
                 f"pre-loaded {hash_count} content hashes"
             )
 
+    def dispatch(self, event: FileSystemEvent):
+        """Early filter: skip events for files/dirs we don't care about.
+
+        This runs BEFORE on_created/on_modified, avoiding unnecessary
+        method dispatch overhead for the majority of file events.
+        """
+        path = Path(event.src_path)
+
+        # Skip .system_generated and logs subdirectories immediately
+        path_parts = path.parts
+        if '.system_generated' in path_parts or 'logs' in path_parts:
+            return
+
+        # For file events, skip non-watched files immediately
+        if not event.is_directory:
+            file_name = path.name
+            if not self._is_watched_file(file_name):
+                return
+
+        super().dispatch(event)
+
     def _is_conversation_id(self, name: str) -> bool:
         parts = name.split("-")
         return len(parts) == 5 and all(len(p) >= 4 for p in parts)