Add .gitignore file

Initialize project with appropriate ignore patterns for Node.js project including dependencies, build outputs, IDE files, and development tools.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,71 @@
+# Dependencies
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Build outputs
+build/
+dist/
+*.tsbuildinfo
+
+# IDE and editor files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Logs
+logs
+*.log
+
+# Environment variables
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Cache directories
+.cache/
+.parcel-cache/
+
+# AI and development tools
+.ai/
+.claude/
+.bmad-core/
+
+# Temporary files
+tmp/
+temp/
+*.tmp
+*.temp
+
+# Package manager lockfiles (keep only one)
+package-lock.json
+yarn.lock
+
+# Test coverage
+coverage/
+.nyc_output/
+
+# Documentation (if auto-generated)
+
+# Husky hooks
+.husky/
+
+# Release configuration
+.releaserc.json
+
+# Changelog (if auto-generated)
+CHANGELOG.md