build(mobile): move to TypeScript 7 and Vitest 5, typecheck through the root tsrs runner (#33419)

- Bump mobile typescript to ^7.0.2 and vitest to 5.0.5; keep TypeScript 6 as typescript-api
  for the test-support code that walks the AST, mirroring the root.
- Patch Expo CLI's tsconfig reader to fall back to typescript-api: TypeScript 7 has no
  compiler API, and Metro otherwise crashes reading tsconfig paths.
- Register mobile/tsconfig.json and mobile/tsconfig.test.json with the root typecheck runner;
  locally they use incremental tsrs (Bun elsewhere), CI uses Bun like root CI.
- Route the tests-typecheck ratchet through the same compiler selection.
- Enforce root/mobile parity for typescript, typescript-api and vitest.

.github/workflows/mobile.yml

@@ -32,6 +32,10 @@ on:
       - '.github/workflows/mobile.yml'
       - 'config/mobile-ci.vitest.config.mjs'
       - 'config/scripts/run-mobile-ci-tests.mjs'
+      # Mobile typechecks run through the root compiler selection.
+      - 'config/scripts/run-typecheck-projects-in-parallel.mjs'
+      - 'config/scripts/tsrs-typecheck-compiler.mjs'
+      - 'config/scripts/pinned-bun-executable.mjs'
       - 'config/oxlint-code-quality-native-plugins.json'
       - 'config/.bun-version'
       - '.github/actions/install-node-dependencies/**'
@@ -76,6 +80,9 @@ on:
       - '.github/workflows/mobile.yml'
       - 'config/mobile-ci.vitest.config.mjs'
       - 'config/scripts/run-mobile-ci-tests.mjs'
+      - 'config/scripts/run-typecheck-projects-in-parallel.mjs'
+      - 'config/scripts/tsrs-typecheck-compiler.mjs'
+      - 'config/scripts/pinned-bun-executable.mjs'
       - 'config/.bun-version'
       - '.github/actions/install-node-dependencies/**'
       - '.github/actions/setup-pnpm/**'
@@ -114,7 +121,7 @@ jobs:
       # from the Gemfile, which is how the release jobs could land on different
       # fastlane versions in the first place. Fail here instead.
       BUNDLE_FROZEN: 'true'
-      ORCA_MOBILE_TYPECHECK_COMPILER: 'native'
+      ORCA_MOBILE_TYPECHECK_COMPILER: 'bun'
 
     defaults:
       run:
@@ -171,9 +178,7 @@ jobs:
       - name: Typecheck
         id: production-types
         background: true
-        env:
-          GOMAXPROCS: '2'
-        run: node scripts/typecheck-mobile.mjs
+        run: node ../config/scripts/run-typecheck-projects-in-parallel.mjs --compiler=bun --bun-threads=2 --project=mobile/tsconfig.json
 
       # Why a ratchet and not the raw typecheck: mobile/tsconfig.json excludes test files, so until
       # tsconfig.test.json existed nothing checked them, and at introduction 127 of the 632 had
@@ -182,8 +187,6 @@ jobs:
       - name: Typecheck tests (ratchet)
         id: test-types
         background: true
-        env:
-          GOMAXPROCS: '2'
         run: node scripts/check-tests-typecheck-ratchet.mjs
 
       # This includes the bridged replay of the whole recording corpus, which used to be a second
@@ -304,7 +307,7 @@ jobs:
   main-tests:
     name: Mobile tests on main
     env:
-      ORCA_MOBILE_TYPECHECK_COMPILER: 'native'
+      ORCA_MOBILE_TYPECHECK_COMPILER: 'bun'
     if: github.event_name == 'push'
     # Why ARM: the same pure-Node Vitest run `verify` makes on a pull request.
     runs-on: blacksmith-4vcpu-ubuntu-2404-arm
@@ -331,15 +334,11 @@ jobs:
       - name: Typecheck
         id: production-types
         background: true
-        env:
-          GOMAXPROCS: '2'
-        run: node scripts/typecheck-mobile.mjs
+        run: node ../config/scripts/run-typecheck-projects-in-parallel.mjs --compiler=bun --bun-threads=2 --project=mobile/tsconfig.json
 
       - name: Typecheck tests (ratchet)
         id: test-types
         background: true
-        env:
-          GOMAXPROCS: '2'
         run: node scripts/check-tests-typecheck-ratchet.mjs
 
       # The whole suite, not only the recordings: the mutant and page-bridge suites read the goldens