Key changes:
- Add outer_aead_key_for_sending() to gate outer encryption on PSQ completion
(fixes bug where initiator encrypted msg 1 before responder could decrypt)
- Add handshake_and_register_with_credential() to NestedLpSession for mock ecash
- Update PSQState::InitiatorWaiting to store PSK instead of ciphertext
- Add probe-localnet.sh script for two-hop localnet testing
- Update gateway handler with connection lifecycle statistics
The PSK timing fix ensures the first Noise message is sent in cleartext
because the responder hasn't derived the PSK yet from the PSQ payload.
durch
bf8e061310