Remove legacy reconciliation path

internal/framework/semanticreconcile/proposal.go

@@ -1,6 +1,9 @@
 package semanticreconcile
 
-import "sort"
+import (
+	"fmt"
+	"sort"
+)
 
 // ProposalResponse is the complete private structured response contract.
 type ProposalResponse struct {
@@ -35,6 +38,16 @@ type Issue struct {
 	Category   IssueCategory
 }
 
+// IssueDetails renders stable, domain-neutral proposal diagnostics for an
+// adapter's retry message.
+func IssueDetails(issues []Issue) []string {
+	details := make([]string, len(issues))
+	for index, issue := range issues {
+		details[index] = fmt.Sprintf("group %d: %s", issue.GroupIndex, issue.Category)
+	}
+	return details
+}
+
 // PlanGroup identifies one validated group using original candidate positions.
 type PlanGroup struct {
 	memberPositions   []int

internal/framework/semanticreconcile/proposal_test.go

@@ -39,6 +39,17 @@ func TestAssessProducesAStableOriginalPositionPlan(t *testing.T) {
 	}
 }
 
+func TestIssueDetailsPreservesIssueOrder(t *testing.T) {
+	issues := []Issue{
+		{GroupIndex: 3, Category: IssueCanonicalUnknown},
+		{GroupIndex: 1, Category: IssueMemberUnknown},
+	}
+	want := []string{"group 3: canonical_unknown", "group 1: member_unknown"}
+	if got := IssueDetails(issues); !reflect.DeepEqual(got, want) {
+		t.Fatalf("IssueDetails() = %#v, want %#v", got, want)
+	}
+}
+
 func TestAssessRejectsEveryUnsafeLocalGroupShape(t *testing.T) {
 	preparation := proposalPreparation(t)
 	tests := []struct {