Add CI build job to reduce broken main

[randavidovitz]

Summary

• Add build job to CI that runs cargo build --workspace --lib on all 3 platforms (ubuntu, macos, windows)
• This catches compilation/linker errors before merge, preventing broken builds from being merged
• Fix formatting issues
• Fix audit critical issues (manual upgrade until handle by parent dependency)
• Fix compilation issues related to xxx ( fixes Not compiling #959 )

Why

Previously CI only ran cargo check (type-level validation). Actual compilation errors could slip through. This ensures the code actually compiles before merging.

Testing

• Verify CI passes on this PR
• cargo clippy --workspace --all-targets -- -D warnings passes
• cargo test --workspace passes
• Live integration tested (if applicable)

Security

• No new unsafe code
• No secrets or API keys in diff
• User input validated at boundaries