ci(ios): cache agent-device's XCUITest runner

[krozniata]

Summary

Test Plan

What's required for testing (prerequisites)?

What are the steps to reproduce (after prerequisites)?

Compatibility

OS	Implemented
iOS	✅❌
Android	✅❌

Checklist

• I have tested this on a device and a simulator
• I added the documentation in README.md
• I updated the typed files (TS and Flow)

[Copilot]

🔵 Needs a closer look

The cache may retain session data and become stale when package contents change without a version change.

0 open findings

What changed in this PR

Adds GitHub Actions caching for the agent-device iOS XCUITest runner to reduce CI setup time.

Changes:

• Restores and saves the runner cache around iOS tests.
• Keys caching by platform, architecture, package version, and Xcode version.
• Attempts to exclude session-specific files.

File	Summary
.github/​workflows/​ios.yml	Adds runner caching; cache exclusion and key composition require changes.

🧠 Review effort: Lite

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[github-actions]

🟢 e2e: 13 passed

All 13 tests in 11 files

	Test	Time
🟢	tests/basic-pager.e2e.ts · 3 passed	3m 1s
🟢	basic pager › in LTR › pages horizontally	2m 2s
🟢	basic pager › in LTR › pages vertically	23.2s
🟢	basic pager › in RTL › pages horizontally with the reversed gesture	35.8s
🟢	tests/issues/issue-1083-modal-set-page.e2e.ts · 1 passed	13.9s
🟢	setPage called behind a native-stack modal lands on the requested page	13.9s
🟢	tests/issues/issue-1096-keyboard-shrink.e2e.ts · 1 passed	19.3s
🟢	keyboard avoidance does not shrink the page under the keyboard	19.3s
🟢	tests/issues/issue-1098-nested-pager.e2e.ts · 1 passed	13.4s
🟢	outer pager stays responsive after its page count changes around a nested pager	13.4s
🟢	tests/issues/issue-1142-search-bar-inset.e2e.ts · 1 passed	16.2s
🟢	FlatList inside the pager gets the search bar safe-area insets	16.2s
🟢	tests/material-top-bar.e2e.ts · 1 passed	17.8s
🟢	material top tabs survive a native-stack push and pop	17.8s
🟢	tests/nested-pager-view.e2e.ts · 1 passed	17.4s
🟢	nested horizontal and vertical pagers scroll independently	17.4s
🟢	tests/on-page-selected.e2e.ts · 1 passed	18.6s
🟢	onPageSelected fires an alert for every page change	18.6s
🟢	tests/scrollable-pager-view.e2e.ts · 1 passed	37.7s
🟢	pager inside a ScrollView keeps its page across vertical scrolls	37.7s
🟢	tests/smoke.e2e.ts · 1 passed	21.6s
🟢	horizontal pager pages with the panel buttons	21.6s
🟢	tests/tab-view-inside-scroll-view.e2e.ts · 1 passed	17.5s
🟢	TabView inside a ScrollView swipes tabs and scrolls the page	17.5s

_{e2e 0.21.0 · 6m 19s · ios · run artifacts}