fix: restore parse_model_output exception parity with original bare except

- Outer/inner handlers use except Exception (same outcomes as prior bare except for app errors)
- Remove unused ValidationError import from cell 3

Made-with: Cursor

training/train_grpo.ipynb

@@ -615,7 +615,8 @@
         "        for a in data.get(\"scheduled_actions\", []):\n",
         "            try:\n",
         "                scheduled.append(ScheduledAction(**a))\n",
-        "            except (TypeError, ValueError, KeyError):\n",
+        "            except Exception:\n",
+        "                # Same as original bare `except:`: skip invalid scheduled_actions entries\n",
         "                pass\n",
         "        return ViraltestAction(\n",
         "            tool_calls=tool_calls,\n",
@@ -623,7 +624,8 @@
         "            replies=data.get(\"replies\", []),\n",
         "            notes=data.get(\"notes\"),\n",
         "        )\n",
-        "    except (json.JSONDecodeError, TypeError, ValueError, KeyError):\n",
+        "    except Exception:\n",
+        "        # Same behavior as original bare `except:`: any parse/validation failure -> empty action\n",
         "        return ViraltestAction(scheduled_actions=[])\n",
         "\n",
         "\n",