Implement deterministic check APIs

internal/policy/package.go

@@ -144,6 +144,11 @@ func LoadAndValidateFile(ctx context.Context, path string) (*Package, error) {
 	return pkg, nil
 }
 
+// Evaluate runs the package decision entrypoint for a normalized check request.
+func (p *Package) Evaluate(ctx context.Context, request api.CheckRequest) (api.DecisionExpectation, error) {
+	return p.evaluateDecision(ctx, request)
+}
+
 // Validate runs metadata, CARING, OPA parse/test, and fixture validation.
 func (p *Package) Validate(ctx context.Context) ValidationResult {
 	result := ValidationResult{}