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

fixtures/packages/hale2026harmonic-damb.checks-only/provenance.json

@@ -0,0 +1 @@
+{"note":"Built by hand for the conformance suite; every reading is synthetic.","stages":[{"processor":"local","stage":"hand","tool":"paperspec tools/build.py"}],"tools":[{"name":"paperspec tools/build.py","version":"0.1.0"}]}