[build-tools] replace record-sim with serve-sim recording

[gwdp]

Why

Build-tools currently starts record-sim, which captures and encodes the simulator screen separately from serve-sim's WebRTC stream. The serve-sim stack now records from its shared H.264 output, so build-tools should use that client and remove the extra binary.

Depends on expo/serve-sim#208 being released first.

How

Start serve-sim record-video using the same serve-sim package spec as the preview. Wait for the token-bearing preview and recording start acknowledgement, then stop with SIGINT and wait for the manifest; retain SIGKILL fallback and retries. Remove record-sim source and worker packaging. The upload step and manifest schema are unchanged.

Test Plan

# packages/build-tools
corepack yarn jest-unit --runInBand src/steps/utils/__tests__/IosSimulatorRecordingUtils.test.ts src/steps/utils/__tests__/remoteDeviceRunSession.test.ts src/steps/functions/__tests__/uploadDeviceRunSessionScreenRecordings.test.ts
                                              73 passed
corepack yarn typecheck                        passed

# repository root
corepack yarn lint                             passed, 0 warnings/errors
corepack yarn oxfmt --check packages/build-tools/src/steps/utils/IosSimulatorRecordingUtils.ts packages/build-tools/src/steps/utils/remoteDeviceRunSession.ts packages/build-tools/src/steps/utils/__tests__/IosSimulatorRecordingUtils.test.ts packages/build-tools/src/steps/utils/__tests__/remoteDeviceRunSession.test.ts
                                              passed
bash -n packages/worker/package.sh            passed
jq empty packages/build-tools/package.json    passed
git diff origin/main...HEAD --check            passed

The built local serve-sim CLI was also exercised in a Tart VM (Xcode 26.4, pinned iPhone 17 UDID EF9955A9-7D07-4D5F-BC33-1A946BB52958). Recording with 0, 1, and 2 H.264 WebRTC viewers produced the existing manifest schema and decodable MP4s. The two-viewer run showed 357 shared encode completions, 353 frames sent to each peer, and 361 MP4 frames over seven seconds. This validates the serve-sim CLI contract and upload manifest shape; a full hosted EAS worker run remains unverified.

[github-actions]

⏩ The changelog entry check has been skipped since the "no changelog" label is present.

[codecov]

Codecov Report

❌ Patch coverage is 82.35294% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.62%. Comparing base (b1f886e) to head (a0f3012).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...ools/src/steps/utils/IosSimulatorRecordingUtils.ts	81.02%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4474      +/-   ##
==========================================
+ Coverage   72.42%   72.62%   +0.20%     
==========================================
  Files         975      975              
  Lines       46617    46682      +65     
  Branches    10069    10081      +12     
==========================================
+ Hits        33760    33897     +137     
+ Misses      11857    11794      -63     
+ Partials     1000      991       -9     

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