MLKEM bindings and wrappers

[Khang (nnmkhang)]

Description of Changes:

Added MLKEM

Breaking Changes if any:

• bump symcrypt-sys to 0.5.0
• bump rust-symcrypt from to 0.6.0
• update MSRV to 1.85.

✅ Admin Checklist

• Review the PR description and ensure all necessary details are included.
• Update/add unit tests for changed code.
• Update/add documentation for new or changed APIs.
• Run cargo test --all-features on Windows and WSL.

Check the Developer Guidelines in DEVELOPER.md for more info.

[Copilot]

Pull request overview

Adds ML-KEM support through generated SymCrypt bindings and safe Rust wrappers.

Changes:

• Adds ML-KEM key generation, import/export, encapsulation, decapsulation, and tests.
• Pins SymCrypt v103.6.0 and updates crate versions and bindings.
• Re-enables Windows CI with v103.6.0 binaries.

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Cargo.toml	Updates symcrypt-sys; MSRV remains inconsistent.
Cargo.lock	Refreshes crate versions.
.github/workflows/build_windows.yml	Re-enables Windows builds and tests.
rust-symcrypt/INSTALL.md	Points installation guidance to v103.6.0.
rust-symcrypt/README.md	Documents ML-KEM and minimum SymCrypt version.
rust-symcrypt/src/lib.rs	Exposes the ML-KEM module.
rust-symcrypt/src/mlkem.rs	Implements and tests safe ML-KEM wrappers.
symcrypt-bindgen/Cargo.toml	Bumps bindgen utility version.
symcrypt-bindgen/src/main.rs	Allows ML-KEM symbols during generation.
symcrypt-sys/Cargo.toml	Bumps FFI crate version.
symcrypt-sys/VERSION.md	Pins the v103.6.0 commit.
symcrypt-sys/inc/symcrypt_internal_shared.inc	Updates the SymCrypt API minor version.
symcrypt-sys/src/bindings/aarch64_pc_windows_msvc.rs	Adds Windows ARM64 ML-KEM bindings.
symcrypt-sys/src/bindings/aarch64_unknown_linux_gnu.rs	Adds Linux ARM64 ML-KEM bindings.
symcrypt-sys/src/bindings/x86_64_pc_windows_msvc.rs	Adds Windows x64 ML-KEM bindings.
symcrypt-sys/src/bindings/x86_64_unknown_linux_gnu.rs	Adds Linux x64 ML-KEM bindings.

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