perf: reduce Apple runner build overhead

[thymikee]

Summary

Reduce cold Apple runner build overhead by replacing the SwiftUI host app with a minimal native Objective-C host app and disabling unneeded Xcode build products for runner builds.

Platform / destination	Variant	5 cold wall runs (s)	Avg wall	Avg SwiftCompile	Swift tasks	Swift archs	Delta
iOS simulator / concrete iPhone 17 Pro	baseline	9.34, 8.25, 7.77, 8.51, 8.26	8.42s	12.311s	15	arm64	-
iOS simulator / concrete iPhone 17 Pro	optimized	6.75, 6.56, 6.49, 6.56, 5.89	6.45s	8.765s	12	arm64	23.4% faster
macOS / arm64	baseline	14.93, 11.01, 9.86, 10.20, 9.98	11.20s	10.919s	15	arm64	-
macOS / arm64	optimized	7.84, 8.30, 8.22, 7.90, 7.89	8.03s	9.789s	12	arm64	28.3% faster

Details:

• Removed SwiftUI from the host app target, which drops the app-target Swift files and generated Swift asset symbol work.
• Added runner build settings for active arch, no previews, and no debug dylib alongside the existing no-index/no-coverage settings.
• Fixed the tvOS build by keeping the keyboard return tap/typeText helper iOS-only.
• Confirmed concrete simulator build-for-testing is already arm64-only on Xcode 26.2, so the expected universal-to-active-arch 2x win is not available on the runtime prepare/snapshot path. Generic iOS/tvOS script builds remain universal because they use device-free generic simulator destinations.

Touched files: 9. Scope stayed within Apple runner build/project code and its existing unit coverage.

Validation

Verified with timeout-wrapped commands to avoid stuck build/check processes:

• Direct formatter on touched JS/TS files: passed.
• ./node_modules/.bin/vitest run src/platforms/ios/__tests__/runner-client.test.ts: 57 tests passed.
• ./node_modules/.bin/oxlint . --deny-warnings: passed.
• ./node_modules/.bin/tsc -p tsconfig.json: passed.
• AGENT_DEVICE_XCUITEST_PLATFORM=macos sh ./scripts/build-xcuitest-apple.sh: passed.
• AGENT_DEVICE_XCUITEST_PLATFORM=ios sh ./scripts/build-xcuitest-apple.sh: passed.
• AGENT_DEVICE_XCUITEST_PLATFORM=tvos sh ./scripts/build-xcuitest-apple.sh: passed.

Notes: pnpm format, pnpm exec vitest ..., and pnpm check:quick hung before spawning their underlying tools in this environment, so I interrupted those wrapper processes and ran the local binaries directly with timeouts.

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Size Report

Metric	Base	Current	Diff
JS raw	1.4 MB	1.4 MB	+68 B
JS gzip	445.2 kB	445.2 kB	+44 B
npm tarball	583.3 kB	584.0 kB	+685 B
npm unpacked	2.0 MB	2.0 MB	+2.5 kB

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	28.1 ms	28.9 ms	+0.9 ms
CLI --help	48.7 ms	50.0 ms	+1.3 ms

Top changed chunks:

Chunk	Raw diff	Gzip diff
dist/src/9722.js	+68 B	+44 B

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PR Preview Action v1.8.1
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2026-06-27 11:48 UTC