- Add new sal-net package to the workspace.
- Update MONOREPO_CONVERSION_PLAN.md to reflect the
addition of the sal-net package and mark it as
production-ready.
- Add Cargo.toml and README.md for the sal-net package.
- Add a new `sal-os` package containing OS interaction utilities.
- Update workspace members to include the new package.
- Add README and basic usage examples for the new package.