Clarify provenance note

releases/unet/run_info.json

@@ -111,5 +111,5 @@
     }
   ],
   "final_model_training_time_s": 1274.5774566119999,
-  "git_commit_note": "history rewritten 2026-09-26 (commit metadata only); originally recorded as 3cbe784"
+  "git_commit_note": "history rewritten 2026-09-26 (commit messages, one docstring and a non-code file changed; training code identical); originally recorded as 3cbe784"
 }