feat: add standalone Playwright recorder tool with Docker-based codegen

- introduce repo-local, ephemeral Playwright codegen workflow
- add executable codegen script using official Playwright Docker image
- persist generated recordings under recordings/ (git-ignored, .gitkeep)
- add minimal Makefile with install and codegen targets
- switch project license to MIT
- improve README with clear usage, requirements, and design rationale
- add MIRRORS file for multi-remote setup
- clean up gitignore for generated artifacts and node tooling

.gitignore

@@ -1,3 +1,16 @@
+# Playwright recorder outputs (generated artifacts)
+recordings/*
+!recordings/.gitkeep
+
+# Ephemeral workspace used by recorder
+recordings/.work/
+
+# Optional: if you later add node/npm files here
+node_modules/
+npm-debug.log*
+pnpm-debug.log*
+yarn-error.log*
+
 .venv/
 dist/
 build/