chore: update gitignore to prevent credential exposure

- Ignore wrangler.toml files (may contain secrets)
- Ignore .env files
- Use .example versions for templates

🤖 Generated with Claude Code

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

Author: bhunt

.gitignore

@@ -0,0 +1,42 @@
+# Environment variables - NEVER commit secrets
+.env
+.env.local
+.env.*.local
+.env.production.local
+
+# Wrangler configs (may contain secrets, use .example versions)
+wrangler.toml
+wrangler.toml.local
+*/wrangler.toml
+*/wrangler.toml.local
+*/wrangler.jsonc
+
+# Node modules
+node_modules/
+dist/
+build/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Test coverage
+coverage/
+.nyc_output/
+
+# Build artifacts
+*.tsbuildinfo
+
+# Session files
+~/.binary_tutor/
+
+# Logs
+logs/
+*.log