fix: Add Cargo.lock file

[amackillop]

In general, the Cargo.lock file should be included for applications and excluded for libraries.

For fun I also asked goose:

( O)> Should a Cargo.lock file be included in this project?

...

Yes, a Cargo.lock file should definitely be included in this project. Here's why:

1. This is a Rust project with multiple crates in a workspace structure
2. Currently there is no Cargo.lock file present
3. According to Rust best practices:
   - For binary projects (which this appears to be, given the CLI component), Cargo.lock SHOULD be committed to version control
   - Even for library projects, when using a workspace structure, it's recommended to commit the Cargo.lock file to ensure consistent builds across the workspace