Fire a separate high-importance system notification when an incoming
payment request (Invoice1 -> SurfaceRequest) is ingested over nostr,
mirroring the existing received-payment notification (id=2). Fail-open on
a missing JNI handle; fires once per not-yet-seen slate. No-op off Android.
Also add examples/tunnel_measure.rs, a dev harness for measuring the Nym
read tunnel (cold connect + warm per-fetch latency over the real transport).
2ro
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