refactor(psk): replace free functions with HandshakeExt trait#40

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maxholman wants to merge 7 commits intoblock65:mainfrom

maxholman:feat/capability-handshake

Commits on Feb 28, 2026

docs: add capability handshake and zero-config design specs

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feat(wire): replace ExitNodeHello with bidirectional Handshake proto

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feat(core): add PSK proof, HMAC module, and rename bridge → protocol

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feat(core): wire handshake exchange into client/server transport

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feat(daemon): integrate handshake exchange and PSK validation

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chore: move serialize_for_proof to Handshake impl, bump bloat limits

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refactor(psk): replace free functions with HandshakeExt trait
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