Ombracrypt v0.4.3: Hybrid KEM & Cryptographic Hardening

This release introduces the X-Wing hybrid post-quantum architecture, advanced key synthesis, and strict memory safety protocols.

Hybrid KEM Engine: Fuses classical X25519 with Post-Quantum Kyber-768 using a SHA-256 combiner to mitigate both classical and quantum threat vectors.
Bitwise Key Synthesis: The final symmetric payload key is now deterministically synthesized via a Bitwise XOR merge of the Argon2id password hash and the machine-generated KEM secrets.
Memory Zeroization: Integrated the zeroize crate to aggressively scrub all ephemeral keys, shared secrets, and passcodes from active RAM immediately upon task completion.
Trapdoor Refinement: The Plausibly Deniable Duress Protocol was hardened. It now strictly overwrites the .obk file with cryptographically secure random noise and halts with a standard authentication error.

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