we (web engine): Experimental web browser project to understand the limits of Claude

Implement TLS 1.3 key schedule (RFC 8446 §7) master

Key schedule for deriving encryption keys from shared secrets using HKDF. Includes HKDF-Expand-Label, Derive-Secret, transcript hashing, traffic key/IV derivation, and Finished verify data computation. Supports all three TLS 1.3 cipher suites (AES-128-GCM, AES-256-GCM, ChaCha20-Poly1305). Also adds Clone derive to SHA-256, SHA-384, SHA-512 hashers in the crypto crate to support transcript hash snapshotting. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>


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