Pq mls ciphersuites#110
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…Q KEMs, SHAKE256 KDF, and ML-DSA
Follow-up fixes after opening the PR: - openmls_traits builds standalone again: keep the ML-DSA seed in a Zeroizing byte array and hand from_seed a short-lived B32, since B32 is not Zeroize in the traits crate's own feature set. - depend on hpke 0.14.0 from crates.io instead of the emil-wire fork now that the PQ KEMs are upstream; features collapse to nistp and mlkem. - build ml-dsa with default-features = false to drop the getrandom 0.3 pull that broke the wasm32 build. - cargo fmt.
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Adds the nine post-quantum ciphersuites from draft-ietf-mls-pq-ciphersuites-04 (placeholder codepoints 0xF001-0xF009, IANA TBD).
What's here
ML-KEM-768/1024 and the MLKEM768-X25519 / MLKEM768-P256 / MLKEM1024-P384 hybrids, plus SHAKE256 HPKE
ML-DSA-65/87 signature credentials (raw FIPS-204, empty context).
Key schedule over the SHAKE256 one-shot KDF, sized at KDF.Nh = 64.
The MLS key schedule needs Extract/Expand, but SHAKE256 is single-stage Derive only. We follow the unmerged one-shot construction from mls-pq-ciphersuites#21:
Draft while the KDF construction and codepoints settle.