Add designlang public-shell pack; tighten auth capture checks

Ran authenticated extract against coulomb.social; session metadata
matched anonymous Bubble defaults, so treat docs/design-extract as a
public shell baseline (PROVENANCE.md). Capture script now refuses to
overwrite storage-state.json with thin anonymous sessions.

docs/design-extract/storybook/.storybook/main.ts

@@ -0,0 +1,8 @@
+import type { StorybookConfig } from '@storybook/react-vite';
+
+const config: StorybookConfig = {
+  stories: ['../stories/**/*.mdx', '../stories/**/*.stories.@(ts|tsx)'],
+  addons: ['@storybook/addon-essentials', '@storybook/addon-docs'],
+  framework: { name: '@storybook/react-vite', options: {} },
+};
+export default config;

docs/design-extract/storybook/.storybook/preview.ts

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+import type { Preview } from '@storybook/react';
+import './../stories/tokens.css';
+
+const preview: Preview = {
+  parameters: {
+    backgrounds: { default: 'paper' },
+    controls: { matchers: { color: /(background|color)$/i } },
+  },
+};
+export default preview;

docs/design-extract/storybook/README.md

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+# Index | Coulomb · Storybook
+
+Auto-generated by `designlang <url> --storybook`.
+
+## Stories
+_No anatomy detected on the source page._
+
+## Run
+
+```
+npm install
+npm run storybook
+```
+
+Opens at http://localhost:6006.

docs/design-extract/storybook/package.json

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+{
+  "name": "index---coulomb-storybook",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "storybook": "storybook dev -p 6006",
+    "build-storybook": "storybook build"
+  },
+  "dependencies": {
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0"
+  },
+  "devDependencies": {
+    "@storybook/addon-essentials": "^8.0.0",
+    "@storybook/addon-docs": "^8.0.0",
+    "@storybook/blocks": "^8.0.0",
+    "@storybook/react": "^8.0.0",
+    "@storybook/react-vite": "^8.0.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "storybook": "^8.0.0",
+    "typescript": "^5.0.0",
+    "vite": "^5.0.0"
+  }
+}

docs/design-extract/storybook/stories/Tokens.mdx

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+import { Meta, ColorPalette, ColorItem, Typeset } from '@storybook/blocks';
+
+<Meta title="Extracted/Tokens" />
+
+# Design tokens
+
+Extracted from https://coulomb.social by [designlang](https://github.com/Manavarya09/design-extract).
+
+<ColorPalette>
+  <ColorItem title="primary"    colors={{ primary: '#d08728' }} />
+  <ColorItem title="secondary"  colors={{ secondary: '#8b5cf6' }} />
+  <ColorItem title="accent"     colors={{ accent: '#f59e0b' }} />
+  <ColorItem title="background" colors={{ background: '#ffffff' }} />
+  <ColorItem title="foreground" colors={{ foreground: '#000000' }} />
+</ColorPalette>

docs/design-extract/storybook/stories/tokens.css

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+:root {
+  --color-primary: #d08728;
+  --color-secondary: #8b5cf6;
+  --color-accent: #f59e0b;
+  --color-background: #ffffff;
+  --color-foreground: #000000;
+  --radius: 8px;
+  --shadow: rgb(97, 97, 97) 2px 2px 8px 0px;
+  --font-sans: 'Times New Roman', system-ui, sans-serif;
+}
+body { background: var(--color-background); color: var(--color-foreground); font-family: var(--font-sans); }

docs/design-extract/storybook/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "jsx": "react-jsx",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true
+  },
+  "include": [
+    "stories/**/*",
+    ".storybook/**/*"
+  ]
+}