docs: write/optimize READMEs for all published packages

- @vue-tui/runtime: rewrite with pitch, badges, SFC+shallowRef example,
  accurate component/composable tables, app lifecycle examples
- @vue-tui/cli: new README documenting vue-tui dev, HMR, crash recovery
- @vue-tui/testing: rewrite with @testing-library positioning, correct
  async render API, cleanup globals:true requirement
- Add early-stage warning to all sub-packages (matching root README)
- Fix CLI package.json: add license field, correct description

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -83,11 +83,11 @@ useInput((input) => {
 
 ## Packages
 
-| Package | Description |
-| ------- | ----------- |
+| Package                                                              | Description                                                                                                                                                                                |
+| -------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
 | [`@vue-tui/runtime`](https://www.npmjs.com/package/@vue-tui/runtime) | The core framework — Vue 3 renderer for the terminal with components (`Box`, `Text`, `Static`, etc.), composables (`useInput`, `useFocus`, `useExit`, etc.), and yoga-based flexbox layout |
-| [`@vue-tui/cli`](https://www.npmjs.com/package/@vue-tui/cli) | Development tool — `vue-tui dev` starts your app with Vite-powered HMR |
-| [`@vue-tui/testing`](https://www.npmjs.com/package/@vue-tui/testing) | Test harness — render in an isolated fake terminal, simulate input, assert output frame by frame |
+| [`@vue-tui/cli`](https://www.npmjs.com/package/@vue-tui/cli)         | Development tool — `vue-tui dev` starts your app with Vite-powered HMR                                                                                                                     |
+| [`@vue-tui/testing`](https://www.npmjs.com/package/@vue-tui/testing) | Test harness — render in an isolated fake terminal, simulate input, assert output frame by frame                                                                                           |
 
 ## Examples