node: initiator outbound handshake (WHOAREYOU → HANDSHAKE)#27
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- Track pending opens with echoed message nonce; allocOpeningPingHandshake - handleReceive processes WHOAREYOU for initiator and emits HANDSHAKE + session - packet.writeWhoareyouChallengeData for HKDF salt buffer - Integration test: open → WAY → HS → encrypted ping/pong Closes #17.
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Implements issue #17: start a session as initiator with allocOpeningPingHandshake (random throwaway key on the first ordinary), match WHOAREYOU by echoed message nonce, derive keys, sign identity proof, send HANDSHAKE (empty inner message for now), and cache the session with peer_handshake_initiator = false.
Adds packet.writeWhoareyouChallengeData for the HKDF salt buffer.
Test: full open → WAY → HS → post-handshake encrypted ping/pong.
Closes #17.