Prepare sequence registration preflight

internal/engine/load_request.go

@@ -10,6 +10,7 @@ type loadRequest[T any] struct {
 	main              loadInput
 	underlays         []loadGroup
 	definition        Definition[T]
+	sequencePolicy    sequencePolicy
 	sourceVersionMode sourceVersionMode
 	effectiveVersion  *VersionRule
 	overlay           string
@@ -37,6 +38,10 @@ type loadGroup struct{ inputs []loadInput }
 func loadGroupedWithSecretLookup[T any](request loadRequest[T], secrets SecretBinding, lookup secretLookup) (*Loaded[T], error) {
 	request.ordinary = false
 	var diagnostics []Diagnostic
+	policy, policyDiagnostics := compileSequencePolicy(request.definition.sequenceRegistrations)
+	request.sequencePolicy = policy
+	diagnostics = append(diagnostics, policyDiagnostics...)
+	request.definition.sequenceRegistrations = nil
 	if normalized, err := normalizeDestination(request.main.destination); err != nil {
 		diagnostics = append(diagnostics, invalidDestinationDiagnostic(request.main.destination))
 	} else {