Update module path to dappco.re/go/core/store, require dappco.re/go/core/log v0.1.0,
and update all Go import paths and documentation references.
Co-Authored-By: Virgil <virgil@lethean.io>
Replace all fmt.Errorf and errors.New calls in production code
(store.go, scope.go) with structured coreerr.E() from go-log.
Sentinel errors (ErrNotFound, ErrQuotaExceeded) are now *log.Err
values; errors.Is() chains continue to work via Unwrap(). Update
four coverage_test.go assertions to match the new op-prefixed
error format from the All() iterator.
Co-Authored-By: Virgil <virgil@lethean.io>
