Add library build pipeline and token alignment report

- Configure Vite library mode to export MUI theme as plain JS
- Add tsconfig.build.json for declaration generation
- Add package.json exports for theme, Tailwind config, and tokens
- Create src/index.ts as library entry point
- Document token alignment between design system and production
  including colour mapping, flagged conflicts, and breakpoint alignment

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -4,9 +4,32 @@
   "private": true,
   "type": "module",
   "description": "Funeral Arranger Design System — React 19 + MUI v7 + Storybook 9 + Tailwind v3",
+  "main": "./dist/index.js",
+  "module": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "import": "./dist/index.js",
+      "types": "./dist/index.d.ts"
+    },
+    "./theme": {
+      "import": "./dist/index.js",
+      "types": "./dist/index.d.ts"
+    },
+    "./tailwind-config": "./tailwind.config.js",
+    "./tailwind-tokens": "./src/theme/generated/tailwind-tokens.js",
+    "./tokens.css": "./src/theme/generated/tokens.css"
+  },
+  "files": [
+    "dist",
+    "tailwind.config.js",
+    "src/theme/generated/tailwind-tokens.js",
+    "src/theme/generated/tokens.css"
+  ],
   "scripts": {
     "dev": "vite",
-    "build": "tsc && vite build",
+    "build": "tsc --noEmit && vite build",
+    "build:lib": "vite build && tsc -p tsconfig.build.json",
     "preview": "vite preview",
     "storybook": "storybook dev -p 6006",
     "build:storybook": "storybook build",