chore: git cache cleanup

.gitattributes

@@ -0,0 +1,28 @@
+# .gitattributes - LFS filter and binary markers for large files and DBs
+
+# Mark CodeQL DB directories as binary
+codeql-db/** binary
+codeql-db-*/** binary
+
+# Use Git LFS for larger binary database files and archives
+*.db filter=lfs diff=lfs merge=lfs -text
+*.sqlite filter=lfs diff=lfs merge=lfs -text
+*.sqlite3 filter=lfs diff=lfs merge=lfs -text
+*.tar.gz filter=lfs diff=lfs merge=lfs -text
+*.tgz filter=lfs diff=lfs merge=lfs -text
+*.zip filter=lfs diff=lfs merge=lfs -text
+*.iso filter=lfs diff=lfs merge=lfs -text
+*.exe filter=lfs diff=lfs merge=lfs -text
+*.dll filter=lfs diff=lfs merge=lfs -text
+
+# Avoid expensive diffs for generated artifacts and large scan reports
+# These files are generated by CI/tools and can be large; disable git's diff algorithm to improve UI/server responsiveness
+coverage/** -diff
+backend/**/coverage*.txt -diff
+test-results/** -diff
+playwright/** -diff
+*.sarif -diff
+sbom.cyclonedx.json -diff
+trivy-*.txt -diff
+grype-*.txt -diff
+*.zip -diff