feat: CI/CD - Go mod tidy checker

[jpmcb]

• 🧹 A dagger check for Go mod tidy-ness: checks that go.mod and go.sum don't drift

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[continue]

No docs update needed. This PR adds a CI/CD enforcement check (make tidy-check) that verifies go.mod and go.sum are tidy. This is an internal CI mechanism rather than a command users need to run manually. Contributors who forget to tidy will get a clear CI failure message directing them to run go mod tidy.

PR #100 was merged: feat: CI/CD - Go mod tidy checker
PR URL: #100
Merged by: jpmcb