feat(eas-cli) Remote build log streaming (--stream-logs)

[javascripter]

Why

This PR introduces an opt-in --stream-logs flag to stream remote logs directly to the CLI in real-time.
The goal is to make remote EAS builds feel much closer to expo run:[ios/android] so that humans/agents can debug issues directly inside their terminal.

Starting	Streaming

This is a new feature proposal, so I'm looking to hear what Expo team thinks about this feature.
The PR itself is feature-complete and ready for testing.

Context

Running eas build --wait leaves developers watching a status spinner while the actual build happens on EAS.

This means to debug a build:

• you have to open a browser tab to watch the live logs
• when an issue occurs, you have to copy the actual errors/warning messages on the browser, then paste it into AI agents to provide context and have to repeat these steps until you have resolved build issues.

How

• Core feature: Added the --stream-logs flag to both eas build and eas build:view.
• Cursor Tracking: Uses cursor-based tracking per log file to safely handle log file rotations and avoid re-printing lines across poll cycles.
• Formatting: Maps raw BuildPhase enums to human-readable display names (via buildPhaseDisplayName from @expo/eas-build-job).
  • For multi-platform builds (--platform all), logs are interleaved and therefore prefixed with platform labels (e.g., [Android], [iOS]) to keep the stream readable.
• Validation: Explicitly prevents --stream-logs from being combined with incompatible flags like --no-wait, --json, or --local.

Test Plan

• Unit tests for log parsing, single/multi-platform streaming, cursor deduplication, and flag validation
• Run yarn test src/build/__tests__/logs-test.ts, yarn test src/__tests__/commands/build-stream-logs-test.ts, yarn test src/__tests__/commands/build-view-test.ts

For manual testing, I have verified both eas build and eas build:view locally by running:

cd <PATH_TO_EXPO_APP>
<PATH_TO_REPO>/eas-cli/bin/run build -p android --stream-logs # or #build:view <BUILD_ID> --stream-logs

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**/*	@douglowder
packages/eas-cli/src/commands/build/**	@sjchmiela
packages/eas-cli/src/build/**	@sjchmiela

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