feat(limrun): replace iOS AX automation with the shared XCTest runner - #1

Upstream review: callstack#4224. This fork PR preserves the isolated layer for review.

Summary

Replace Limrun iOS AX automation with the native agent-device XCTest runner, deployed to the simulator through Limrun HTTP forwarding. Snapshots, interactions and Apple operations use shared execution paths; existing commands such as agent-device snapshot -i stay unchanged.

Following #4213, this 136-file replacement has two commits: shared exports/helpers/packaging, then the provider switch and AX deletion. Keeping the switch and deletion together avoids a temporary mixed backend. Scope also includes the Revyl screenshot cancellation test and physical-iPhone replay adjustment. Local app sync follows in #4225.

Validation

Tested 442a6ce44414fcc88ee8a3d5c4bad6de7dfda324 on base 4abff15e. Both pnpm check and pnpm check:affected --run --head HEAD pass with exactCommit: true; the prerequisite commit builds and typechecks independently. Receipts, independent review and live logs include the requested comparison against 0ae3dc2a on the same reused simulator, with prepare/launch diagnostics and runner streams.

Two final reconnects returned 21 snapshot nodes. After killing the active daemon, the next attempt returned limrun_xctest_slot_occupied with recovery guidance. Intermittent XCTest capture stalls remain possible and now report limrun_runner_snapshot_unavailable; this does not claim to repair the underlying XCTest stall. GitHub-owned device/coverage checks remain CI obligations. No fresh physical-phone run is claimed.

^{Open in [code]smith · Need help on this PR? Tag @codesmith-bot with what you need.}