probePrfDeterminism

Diagnostic — derive the SeedDeriver PRF output for the user's passkey and emit the 32-byte hex to logcat (tag PrfProbe). Used to verify that PRF is deterministic across Kuira ecosystem apps that share an RP via assetlinks.json, before relying on it as the wallet seed.

Run on two installs of any Kuira app (Kicks + BBoard, two emulators sharing one Google account, etc.); identical outputs mean PRF-derived seed is viable.

No-op outside debug builds. The action is gated by BuildConfig.DEBUG so production builds don't ship a passkey prompt that leaks 32 bytes of derived material to logcat.