ci(e2e): run expo native e2e flows with agent-device's maestro engine

[wobsoriano]

Description

Replaces the Maestro CLI in the expo native e2e workflow with agent-device, whose test --maestro command runs our existing Maestro flow YAML through its own engine (XCTest on iOS, adb on Android) with a resident daemon instead of a fresh JVM per invocation. Unlike the Argent migration (#9440), the flows stay in the Maestro format, no port to a new flow language.

Flow changes are minimal and behavior-preserving: launchApp.clearKeychain is unsupported by the engine (fails loudly at parse), so the runner script resets the simulator keychain up front instead, and the typed-email visibility assert is dropped because the field's floating label plus value truncation make it unmatchable under this engine's Android accessibility tree (a mangled identifier is still caught by the next screen's wait inside the retry).

Runner scripts collapse into a single agent-device test 'flows/*.yaml' --maestro invocation per platform, with --retries 1 and --artifacts-dir replacing the hand-rolled per-flow retry loop and debug-output plumbing.

Validated locally against the built SDK 57 fixture: iOS passes 6/6 first-attempt in 5m15s (the platform where Argent is hard-blocked). Android validation is still iterating locally; this draft exists to compare CI behavior and runtime against both the Maestro baseline and #9440.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• other: CI / e2e tooling

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview	Aug 13, 2026 5:59pm
swingset	Ready	Preview	Aug 13, 2026 5:59pm

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commit: 2bdf3d4