Extract independent MIT Mortar kit and contribution workflow

src/index.ts

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+export { ThemeProvider, AppearanceControl } from "./foundation.js";
+export type {
+  ThemeProviderProps,
+  Appearance,
+  Brand,
+  Density,
+} from "./foundation.js";
+export {
+  Button,
+  ActionLink,
+  Input,
+  Select,
+  TextArea,
+  Checkbox,
+  RadioGroup,
+  Switch,
+  Badge,
+  Tabs,
+  Modal,
+  Dropdown,
+  Notice,
+  EmptyState,
+} from "./primitives.js";
+export type {
+  ButtonProps,
+  InputProps,
+  LinkAction,
+  Tone,
+} from "./primitives.js";
+export {
+  AppShell,
+  PageHeading,
+  MetricGroup,
+  DataTable,
+  Pagination,
+  SettingsSection,
+  ActivityFeed,
+} from "./application.js";
+export type {
+  AppShellProps,
+  NavigationItem,
+  DataTableProps,
+} from "./application.js";
+export {
+  MarketingHeader,
+  Hero,
+  FeatureGrid,
+  FeatureSection,
+  Testimonial,
+  LogoCloud,
+  Pricing,
+  FAQ,
+  CallToAction,
+  Footer,
+} from "./marketing.js";
+export type { PricingPlan } from "./marketing.js";
+export { SegmentedControl, CodeBlock, PreviewFrame } from "./inspection.js";