chore(tests): commit validation dataset and baseline reports into repo

Move the HF model list from ~/Documents/ into tests/enrich_hf_validation/test_data/
and commit the pipeline validation baseline artifacts (report.json,
preprocessing_audit.json, README snapshots) into baselines/.

Update config.py and run_validation.py defaults to use repo-relative paths
via os.path.dirname(__file__) instead of ~/Documents/ hardcode.

Originates from changes in 8fb00998 (validation pipeline audit).

tests/enrich_hf_validation/run_validation.py

@@ -87,7 +87,7 @@ def _parse_args(argv: List[str]) -> argparse.Namespace:
     )
     parser.add_argument(
         "--models",
-        default="~/Documents/hf_lora_models_with_safetensors.txt",
+        default=os.path.join(os.path.dirname(__file__), "test_data", "hf_lora_models_with_safetensors.txt"),
         help="Path to the HF repo entries file (format: repo_id, model_name.safetensors per line)",
     )
     parser.add_argument(