Initial commit: demo todo CLI with Claude Code setup

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -0,0 +1,28 @@
+# claude-playground
+
+A tiny todo CLI that exists to try out [Claude Code](https://docs.claude.com/en/docs/claude-code) features.
+
+```sh
+npm test
+npm start -- add "try Claude Code"
+npm start -- done 1
+npm start -- ls
+```
+
+## What's set up
+
+| File | Claude Code feature |
+| --- | --- |
+| `CLAUDE.md` | Project memory, loaded into every session |
+| `.claude/settings.json` | Shared permissions + a hook that syntax-checks `.js` files after every edit |
+| `.claude/skills/changelog/` | A custom skill — run `/changelog` |
+| `.claude/agents/test-writer.md` | A custom subagent — "use the test-writer agent to…" |
+
+## Things to try
+
+- *"There's a bug in how ids are assigned after removing a todo — find it and fix it with a test."*
+- *"Use the test-writer agent to cover `src/todo.js`."*
+- *"Add a `--json` flag to `ls`."* then `/code-review`
+- `/changelog` after a few commits
+- Press `shift+tab` to cycle permission modes (e.g. plan mode before a bigger change)
+- `/memory` to edit CLAUDE.md, `/agents` and `/hooks` to inspect the setup