feat: add P-521 key exchange and ECDSA - #287
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This was referenced Aug 5, 2026
Enable secp521r1 KX and ECDSA_NISTP521_SHA512 sign/verify using the p521 crate, following the existing p256/p384 patterns.
Format verify.rs and remove should_panic from the P-521 group interop test now that secp521r1 is supported.
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Summary
Independent PR based on
master(not stacked).SecP521R1)Test plan
cargo test --lib/ clippy / no_std (1.85)vs_openssl_as_client_group_p521passes