fix(react): address PR #2024 review feedback

Critical:
- Remove undefined/.claude/session-aliases.json containing __proto__ prototype-pollution
  fixture committed by accident in a7333c14

High:
- agents/react-build-resolver.md: replace brittle `test -o $(grep -l ...)` and
  `test -a -n $(grep ...)` detection with explicit `{ ... || grep -q ...; }` so
  bundler detection no longer breaks when grep returns empty
- agents/react-build-resolver.md: drop hardcoded `npm i react@^19 react-dom@^19`
  remediation; replace with version-agnostic pair-upgrade note that honors the
  project's installed major (17/18/19) — surgical fix principle
- commands/react-review.md: guard `tsc --noEmit -p tsconfig.json` with
  `[ -f tsconfig.json ] &&` so the review skips cleanly on JS-only projects

Medium:
- rules/react/security.md: correct the React-18-blocks-javascript-URL claim
  (React only warns in dev; production navigation is not blocked)
- rules/react/security.md: correct CRA env-var exposure row (CRA exposes
  REACT_APP_*, NODE_ENV, PUBLIC_URL — not 'all' variables)
- skills/react-testing/SKILL.md: instantiate QueryClient once outside the
  wrapper closure so React Query cache survives re-renders (flaky-test fix)
- skills/react-testing/SKILL.md: restore console.error spy with mockRestore()
  in a try/finally so the mock does not leak across tests
- commands/react-test.md: switch outer example-session fence to 4 backticks
  so the inner ```tsx/```bash blocks don't prematurely terminate it

rules/react/security.md

@@ -108,7 +108,7 @@ Prefixed env vars are bundled into the client. Treat them as public.
 |---|---|---|
 | Next.js | `NEXT_PUBLIC_*` | All others |
 | Vite | `VITE_*` | `.env` server-side only |
-| Create React App | `REACT_APP_*` | None — CRA exposes all |
+| Create React App | `REACT_APP_*`, plus `NODE_ENV` and `PUBLIC_URL` | All others (anything without the `REACT_APP_` prefix is server-side only) |
 | Remix | `process.env` access in `loader`/`action` only | Same |
 
 ```ts