fix(cli): include React workspace root in project selection

[abekdwight]

Summary

• Include React workspace root project in the selectable project list
• Add discoverRootReactPackage to detect React dependency on workspace root
• Update project selection flow to append root project with duplicate guard (name/directory)
• Add tests for root inclusion, root resolution via --project, and non-React root exclusion

Why

In monorepo setups, react-doctor listed only workspace sub-packages and did not include the workspace root even when the root package used React. This prevented users from selecting and scanning root-based apps directly.

Architecture Changes

TypeScript (CLI):

• Add discoverRootReactPackage(rootDirectory) in discover-project.ts
• Keep hasReactDependency as an internal helper (non-exported)
• In select-projects.ts, append root candidate when eligible and not duplicated
• Preserve existing fallback behavior when no candidates are found

Tests:

• Add tests/select-projects.test.ts
  • includes root package when workspace candidates exist
  • resolves root package with --project
  • excludes root package when root has no React dependency

Test Plan

• pnpm --filter react-doctor run test -- select-projects
• pnpm --filter react-doctor run typecheck
• Manual verification: root project appears as selectable option in monorepo (l-shift-4)

Files Changed

Updated:

• packages/react-doctor/src/utils/discover-project.ts
• packages/react-doctor/src/utils/select-projects.ts

Added:

• packages/react-doctor/tests/select-projects.test.ts

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