49d4432247cdda8ae401e48636109ef9006efd9b
Resolve the cert-type negotiation gap (review 001 §U-3, OQ-TLS-10) by deviation from alknet: the gap was a defect in the prior art (alknet's code never delivered its spec's raw-key-over-TCP promise — ADR-082 "works for both QUIC and TCP+TLS"), not behavior to preserve. - FingerprintPinVerifier::requires_raw_public_keys() derives from the pin format: ed25519: -> true (offer [RawPublicKey]), SHA256: -> false (X.509 offer). Crate pin client now completes against the crate raw-key server; SHA256: pins negotiate unchanged. - RawKeyClientCertResolver presents the SPKI under the X.509 offer (only_raw_public_keys() == false): a raw-only client offer can only negotiate against a requires_raw server verifier, and AcceptAnyCertVerifier correctly stays on the default (accepts both cert types). The server extracts the ed25519: fingerprint from the SPKI bytes either way. - Fail-closed preserved and strengthened: an ed25519: pin against an X.509 server now aborts at negotiation (suite 2b), never a downgrade; no API change (no public signature affected; the fix is invisible to consumers apart from working handshakes). - tests/handshake_behavior.rs: suite 3 now runs crate-native (no custom iroh-shaped verifier), new negotiation fail-closed suite, suite 3b inverted to end-to-end success; invariant_pins.rs resolver-offer assertions flipped; unused imports dropped. - Docs: ADR-007 written; OQ-TLS-10 -> resolved-by-deviation; client.md/server.md/overview/README/task postscript synced (incl. the strict-foreign-server limit in ADR-007 §Limits). Verification: cargo test 81 / --features tcp 94 / --all-features 105 green; clippy -D warnings clean (default + all-features); fmt clean; cargo doc warning-free.
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