[build-tools] Record Android sessions by default through a session host

[vonovak]

Why

Upload Android session recordings through the existing screen-recording artifact contract so the website replays them next to automation events. Recording must outlive preview tunnels: closing or replacing a preview must not stop it, and upload must not delay automation cleanup.

How

• Record Android sessions by default, like iOS.
• The worker starts the Hub with a recording directory and a stop token, finalizes the recording before stopping the Hub, and uploads it with the existing metadata.
• DeviceSessionHost owns the process and the recording for the whole session. A preview is just a tunnel to it; closing a preview no longer stops the process. finishAsync() is terminal and idempotent. Agent Device, Appium, Argent and web-preview callers migrate; the old combined API is removed.
• iOS and Android share the recording validation and upload code. Automation cleanup runs alongside host finalization.

Stack 1/6: this PR → #4420 → #4430 → #4431 → #4435 → #4441. Companion Hub PR: expo/expo-device-hub#112.

Rollout: publish the Hub release first. Recording needs exactly one booted emulator; otherwise the Hub starts without it and logs a warning. iOS recording steps are unchanged.

Test plan

• Host tests cover no-preview recording, concurrent opens and finish, close and reopen, stale handles, late opens and failure cleanup, for all four callers.
• Local end-to-end: API session, Android capture, real Agent Device events, website stop, uploads and playback with marker seeking.
• Not exercised: production Linux launcher, a new live iOS session.

[codecov]

Codecov Report

❌ Patch coverage is 94.50980% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.36%. Comparing base (30a3924) to head (e36c377).

Files with missing lines	Patch %	Lines
...rc/steps/utils/deviceRunSessionScreenRecordings.ts	84.22%	6 Missing ⚠️
...ls/src/steps/functions/startArgentRemoteSession.ts	83.34%	3 Missing ⚠️
...s/build-tools/src/steps/utils/deviceSessionHost.ts	98.13%	3 Missing ⚠️
...unctions/uploadDeviceRunSessionScreenRecordings.ts	75.00%	1 Missing ⚠️
...ld-tools/src/steps/utils/remoteDeviceRunSession.ts	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4418      +/-   ##
==========================================
+ Coverage   72.30%   72.36%   +0.06%     
==========================================
  Files         970      972       +2     
  Lines       46146    46219      +73     
  Branches     9906     9924      +18     
==========================================
+ Hits        33363    33442      +79     
+ Misses      11788    11783       -5     
+ Partials      995      994       -1     

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[github-actions]

✅ Thank you for adding the changelog entry!