Repair generated Expo web smoke hydration

[artiphishle]

Summary

• repair the generated Expo web smoke so the unchanged generated Studio app hydrates in Chrome
• keep the temp app on one symlinked dependency graph instead of copying direct dependency directories
• add a smoke-only Studio manifest API with CORS so StudioProvider can hydrate against the generated manifest

Refs #156. This is a prerequisite only and does not implement or fix Studio canvas selection.

Validation

• ANKH_STUDIO_ADMIN_WEB_SMOKE=1 bun test src/host/generatedAdminExpoWeb.smoke.test.ts (passed 3 consecutive runs)
• bun test src/host/generatedAdminExpoWeb.smoke.test.ts
• bun run typecheck
• bunx ankhorage-eslint src/host/generatedAdminExpoWeb.smoke.test.ts --max-warnings=0
• bunx ankhorage-prettier --check src/host/generatedAdminExpoWeb.smoke.test.ts
• bun run format:check

Known unrelated validation failures

• bun run lint still fails on pre-existing apps/nutri formatting/import issues
• bun run knip still fails on pre-existing apps/nutri unused files/dependencies/exports

Dependency resolution notes

• temp project and temp workspace resolve react, react-dom, react-native, react-native-web, @react-navigation/native, @react-navigation/core, and expo-router to the repo Bun package store via symlinks
• react resolves to /Users/a_rtiphishl_e/git/studio/node_modules/.bun/react@19.1.0/node_modules/react/package.json for the temp project and workspace
• no React Navigation packages are copied; no React aliases are added