Exclude local credentials, private data, and generated artifacts

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

.gitignore

@@ -0,0 +1,54 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/versions
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# env files (can opt-in for committing if needed)
+.env*
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts
+
+# Keep credentials, local state, and agent metadata out of source history
+*.key
+*.pfx
+*.p12
+*.session*
+*.db*
+*.sqlite*
+*.log
+.antigravitycli/
+.agents/
+.codex/
+.claude/