chore: Clean up repository for push - remove large files

- Remove .nekocode_sessions/*.json (analysis files)
- Remove analysis.json (large analysis result)
- Remove NotoSansJP font (9.2MB) from git tracking
- Update .gitignore to prevent future large file commits
- Keep font file locally but don't track in git

.gitignore

@@ -65,4 +65,27 @@ stats_output.txt
 *.bc
 *.o
 *.exe
-a.out
+a.out
+
+# Nekocode analysis files (大きなJSONファイル)
+.nekocode_sessions/
+analysis.json
+nekocode-temp/
+
+# Build outputs and logs
+build_*.txt
+test_*.txt
+*_output.txt
+*_results.txt
+
+# Local test files
+local_tests/
+
+# Windows build artifacts
+*.pdb
+*.exp
+*.lib
+
+# Font files (already in assets/)
+*.ttf
+*.otf