Add Chart package README with framework vision

.gitignore

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 # OS files
 .DS_Store
+.astro/

packages/chart/README.md

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+# @sailkit/chart
+
+A plug-and-play documentation website framework built on Astro that integrates all Sailkit packages out of the box.
+
+## Vision
+
+Chart provides a zero-config documentation website that "just works" while remaining fully customizable. Inspired by Create React App's architecture, it offers:
+
+- **Automatic upgrades** - Stay current with the latest features and security patches without manual migration
+- **Extension points** - Customize behavior through well-defined hooks and configuration without modifying core files
+- **Eject capability** - When you need full control, eject to serialize all dynamic behavior into static configuration files that you own
+
+## Architecture
+
+### Upgrade Path (Default)
+
+By default, your documentation site depends on `@sailkit/chart` which bundles:
+
+- **Compass** - Keyboard-driven vim-style navigation
+- **Atlas** - Magic link resolution and smart routing
+- **Lighthouse** - 404 recovery and broken link detection
+- **Spyglass** - Full-text search with fuzzy matching
+- **Scribe** - Code fence extraction and automated testing
+
+Updates to any of these packages flow through automatically when you update Chart.
+
+```
+your-docs/
+├── content/           # Your markdown/MDX content
+├── public/            # Static assets
+├── sailkit.config.ts  # Extension points and overrides
+└── package.json       # Just depends on @sailkit/chart
+```
+
+### Extension Points
+
+Customize without ejecting through `sailkit.config.ts`:
+
+```typescript
+import { defineConfig } from '@sailkit/chart'
+
+export default defineConfig({
+  // Override default Compass keybindings
+  compass: {
+    keys: {
+      search: '/',
+      next: 'j',
+      prev: 'k',
+    }
+  },
+
+  // Custom Atlas link resolvers
+  atlas: {
+    resolvers: [
+      myCustomResolver
+    ]
+  },
+
+  // Lighthouse 404 behavior
+  lighthouse: {
+    fallbackPage: '/not-found',
+    suggestions: true
+  },
+
+  // Spyglass search configuration
+  spyglass: {
+    indexFields: ['title', 'description', 'content'],
+    fuzzyThreshold: 0.3
+  },
+
+  // Scribe test extraction
+  scribe: {
+    languages: ['typescript', 'javascript'],
+    testRunner: 'vitest'
+  },
+
+  // Astro configuration passthrough
+  astro: {
+    site: 'https://docs.example.com'
+  }
+})
+```
+
+### Eject
+
+When extension points aren't enough:
+
+```bash
+npx sailkit eject
+```
+
+This serializes all dynamic behavior into static files you control:
+
+```
+your-docs/
+├── content/
+├── public/
+├── src/
+│   ├── components/      # Ejected Sailkit components
+│   ├── layouts/         # Ejected layouts
+│   └── integrations/    # Ejected Astro integrations
+├── astro.config.mjs     # Full Astro config (no longer wrapped)
+├── sailkit.config.ts    # Still respected for remaining dynamic parts
+└── package.json         # Now depends on individual @sailkit/* packages
+```
+
+After ejecting:
+- You own the ejected files and can modify them freely
+- Future Chart updates won't override your customizations
+- You can still update individual `@sailkit/*` packages independently
+- Partial eject is supported (eject only specific components)
+
+## CLI
+
+```bash
+# Create a new documentation site
+npx create-sailkit-docs my-docs
+
+# Development server
+npx sailkit dev
+
+# Production build
+npx sailkit build
+
+# Preview production build
+npx sailkit preview
+
+# Eject (full or partial)
+npx sailkit eject
+npx sailkit eject --only compass,atlas
+
+# Run Scribe tests on code fences
+npx sailkit test
+```
+
+## Getting Started
+
+```bash
+npx create-sailkit-docs my-docs
+cd my-docs
+npm run dev
+```
+
+Your documentation site is now running with:
+- Vim-style keyboard navigation
+- Smart internal linking
+- Full-text search
+- 404 recovery
+- Tested code examples
+
+## Roadmap
+
+- [ ] `create-sailkit-docs` CLI scaffolding tool
+- [ ] Core Chart package with Astro integration
+- [ ] Extension point system (`sailkit.config.ts`)
+- [ ] Eject functionality with partial eject support
+- [ ] Theme system with light/dark mode
+- [ ] Versioned documentation support
+- [ ] i18n/localization support
+- [ ] API documentation generation from TypeScript