Add Harness-managed cache for iOS simulator XCTest artifacts#109
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Summary
Add a Harness-owned XCTest cache root under
.harness/cache, where each reusable artifact lives in its own unique subdirectory with a localcache.jsonmanifest.Context
The iOS XCTest agent now discovers reusable simulator artifacts by scanning direct children of
.harness/cache, validating each directory'scache.json, and selecting only artifacts whose build input hash, Xcode version, simulator SDK/runtime, host architecture, and generated.xctestrunmetadata match the current environment. Compatible simulator artifacts are reused from their own unique cache directory, while incompatible ones are ignored and a new unique cache directory is created for the rebuilt artifact. Logs remain separate under.harness/logs.The iOS E2E workflow now restores and saves the full
.harness/cacheroot, and the cache key hashes all direct childcache.jsonfiles viahashFiles('apps/playground/.harness/cache/*/cache.json').Fixes #108
Proposed Testing Scenario
Run the platform iOS test suite locally to verify cache discovery, rebuild, and reuse behavior. Then run the iOS E2E workflow twice on the same Xcode family to confirm a previously generated simulator artifact directory under
.harness/cacheis restored and reused, and repeat with a changed simulator runtime or Xcode version to confirm Harness skips incompatible directories and rebuilds into a new unique cache subdirectory.