chore: Update .gitignore

Author: hustcer

.gitignore

@@ -6,7 +6,15 @@ findings.md
 progress.md
 task_plan.md
 .agents/
+.antigravitycli/
 skills-lock.json
 bench/node_modules/
 tools/zip64-fixtures/output/
 tools/zip64-fixtures/provenance.md
+tools/brotli/fuzz/corpus/
+tools/brotli/.harness-lock/
+src/brotli_conformance_wbtest.mbt
+src/brotli_fuzz_wbtest.mbt
+src/brotli_roundtrip_fuzz_wbtest.mbt
+src/brotli_target_perf_wbtest.mbt
+src/brotli_target_perf_main/