Add dev commands for Maestro smoke flow

[kyle-schellen]

What changed

Adds repo-root dev e2e commands for the shared Maestro checkout smoke flow:

• dev e2e rn-ios
• dev e2e rn-android
• dev e2e swift-ios
• dev e2e android

The React Native commands now wrap the full local setup: start Metro if needed, build/install/launch the target sample app, run Maestro, and clean up Metro if the command started it. The Swift and native Android commands route to their platform runner scripts.

Why

This makes the shared smoke flow discoverable through the repo's existing dev command surface instead of requiring contributors to remember platform-local script paths or manually start React Native prerequisites.

Verification

• dev e2e rn-ios passed end to end from a state where Metro was not already running.
• dev e2e swift-ios passed end to end.
• dev e2e android passed end to end on retry.
• dev e2e rn-android passed end to end using the already-installed RN Android sample app.
• bash -n platforms/react-native/scripts/e2e_maestro_ios
• bash -n platforms/react-native/scripts/e2e_maestro_android

[kyle-schellen]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Add dev commands for Maestro smoke flow #306 👈 (View in Graphite)
• Add shared Maestro checkout smoke flow #305
• Add native Android sample cart bootstrap #304
• Add Swift sample cart bootstrap #303
• Add React Native cart bootstrap #302
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.