fix: commit the fixture packages and log that .gitignore was hiding

fixtures/packages/writer2027fixed-ynr7.v3/references.jsonl

@@ -0,0 +1 @@
+{"csl":{"DOI":"10.5555/example.hale.2026","author":[{"family":"Hale","given":"R."},{"family":"Osei","given":"M."}],"container-title":"J. Example Chem.","issued":{"date-parts":[[2026]]},"page":"101-109","type":"article-journal","volume":"14"},"label":"1","node":"ebcq5cy","resolution":{"doc":"smithlab/hale2026harmonic-damb","type":"document"}}