Save run output to user's media collection

When a recipe run completes, save the output to the user's media
with description and source tracking.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

legacy_tasks.py

@@ -399,6 +399,18 @@ def execute_dag(self, dag_json: str, run_id: str = None) -> dict:
                     ipfs_cid=output_ipfs_cid,
                     actor_id=actor_id,
                 )
+
+                # Save output as media for the user
+                if actor_id:
+                    await database.save_item_metadata(
+                        content_hash=output_hash,
+                        actor_id=actor_id,
+                        item_type="media",
+                        description=f"Output from recipe: {recipe_name}",
+                        source_type="recipe",
+                        source_note=f"run_id: {run_id}",
+                    )
+
                 # Clean up pending run
                 if pending:
                     await database.complete_pending_run(run_id)