Add rule PDP adapter boundary

internal/adapters/rule/policy_artifact.go

@@ -0,0 +1,26 @@
+package rule
+
+import (
+	"github.com/netkingdom/flex-auth/internal/policy"
+	"github.com/netkingdom/flex-auth/pkg/api"
+)
+
+// PolicyArtifactFromPackage preserves the extracted Rego module and metadata
+// from a flex-auth Rego-in-Markdown package.
+func PolicyArtifactFromPackage(pkg *policy.Package) PolicyArtifact {
+	tests := make([]string, 0, len(pkg.TestBlocks))
+	for _, block := range pkg.TestBlocks {
+		tests = append(tests, block.Body)
+	}
+	return PolicyArtifact{
+		ID:       pkg.Metadata.ID,
+		Version:  pkg.Metadata.Version,
+		Language: LanguageRego,
+		Package:  pkg.Metadata.Package,
+		Module:   pkg.RegoModule,
+		Tests:    tests,
+		Fixtures: append([]api.PolicyFixture(nil), pkg.Fixtures...),
+		Caring:   pkg.Metadata.Caring,
+		Metadata: copyMap(pkg.Metadata.Metadata),
+	}
+}