Remove banned imports (fmt, strings, os, errors, path/filepath) across all
production and test files, replace with core.* primitives, coreio.ReadStream,
and coreerr.E. Upgrade dappco.re/go/core v0.5.0 → v0.7.0 for core.PathBase
and core.Is. Fix isRepoScoped to exclude pr.* capabilities (enforcement is at
the forge layer, not the policy engine). Add Good/Bad/Ugly test coverage to
all packages missing the mandatory three-category naming convention.
Co-Authored-By: Virgil <virgil@lethean.io>
7407b89b8d