Implements WASM-compatible Dilithium3 (ML-DSA-65) signatures using the
pure Rust pqc_dilithium crate. This provides NIST Security Category 3
post-quantum signature support for the web wallet.
Changes:
- Add pqc_dilithium dependency with WASM feature
- Create DilithiumSigningKey wrapper for WASM bindings
- Add dilithiumVerify and dilithiumSizes helper functions
- Update tests to work on both native and WASM targets
- Update README to reflect completed Dilithium3 support
Key sizes (Dilithium3 / ML-DSA-65):
- Public Key: 1,952 bytes
- Signature: 3,293 bytes
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