Update training/signal_trainer.py

training/signal_trainer.py

@@ -1,21 +1,35 @@
 # training/signal_trainer.py
+# ------------------------------------------------------------
+# Stage 10C placeholder:
+# Safely returns a no-op result for signal training.
+# This MUST NOT crash during import.
+# ------------------------------------------------------------
 
 from __future__ import annotations
 from typing import Dict, Any
+import json
+import os
+
+
+SIGNALS_PATH = "data/signals_catalog.json"
 
 
 def train_signals() -> Dict[str, Any]:
     """
-    Placeholder for Stage 10C.
+    Placeholder trainer. Does nothing except ensure signals_catalog.json exists.
+    Must NEVER crash.
+    """
 
-    Later this will update:
-       data/signals_catalog.json
+    # Ensure signals catalog exists
+    if not os.path.exists(SIGNALS_PATH):
+        try:
+            with open(SIGNALS_PATH, "w", encoding="utf-8") as f:
+                json.dump({}, f, indent=2, ensure_ascii=False)
+        except Exception:
+            pass
 
-    For now we return a simple stub so that the UI
-    and gold_trainer.py work without errors.
-    """
     return {
         "ok": True,
         "message": "Signal trainer not implemented yet (Stage 10C placeholder).",
-        "signals_catalog_path": "data/signals_catalog.json",
+        "signals_catalog_path": SIGNALS_PATH,
     }