reasoning: ground unclassified answers without category expansion

tests/graph/apply-proposal.test.js

@@ -1568,7 +1568,7 @@ describe("applyValidatedProposal", () => {
     );
   });
 
-  it("57A regression: a legitimate decision-advancing answer classified as other may resolve its intended unknown", () => {
+  it("57F legitimate-answer regression: a grounded unclassified answer may resolve its intended unknown", () => {
     const graph = makeCommercialUpdateFixture();
     const parentId = graph.activeUnknownNodeId;
 
@@ -1640,6 +1640,49 @@ describe("applyValidatedProposal", () => {
     expect(result.stage).toBeUndefined();
   });
 
+  it("57F deterministic reproduction: pre-fix grounded unclassified answer would have been rejected by proposal-text constraint language", () => {
+    const graph = makeCommercialUpdateFixture();
+    const parentId = graph.activeUnknownNodeId;
+
+    const result = applyValidatedProposal({
+      situationGraph: graph,
+      answer:
+        "We're looking at this mainly for cost reduction — roughly £2M annual savings on office overhead.",
+      previousQuestion:
+        "What problem would this need to solve to justify continuing development?",
+      proposal: {
+        addedNodes: [],
+        updatedNodes: [
+          {
+            nodeId: parentId,
+            previousStatus: "unknown",
+            newStatus: "resolved",
+            previousValue: null,
+            newValue:
+              "Cost reduction, including approximately £2M annual office-overhead savings, is a stated reason for considering the relocation.",
+            reason:
+              "The answer establishes that cost reduction is the relevant preference/trade-off consideration for this decision.",
+          },
+        ],
+        addedEdges: [],
+        removedEdgeIds: [],
+        resolvedUnknownNodeIds: [parentId],
+        affectedNodeIds: [],
+        selectedQuestion: null,
+        answerMeaning: {
+          userSupportedMeaning:
+            "Cost reduction, including approximately £2M annual office-overhead savings, is a stated reason for considering the relocation.",
+          possibleInference: null,
+          supportCategory: "other",
+          resolutionGuidance: null,
+        },
+      },
+    });
+
+    expect(result.success).toBe(true);
+    expect(result.updatedSituationGraph.resolvedNodeIds).toContain(parentId);
+  });
+
   it("unsafe unclassified answer: other is not automatically trusted when the proposal adds stronger unsupported meaning", () => {
     const graph = makeCommercialUpdateFixture();
     const parentId = graph.activeUnknownNodeId;
@@ -1902,7 +1945,7 @@ describe("applyValidatedProposal", () => {
     expect(result.success).toBe(false);
     expect(result.stage).toBe("proposal_compatibility");
     expect(result.errors.join(" ")).toContain(
-      "unsupported constraint or preference/trade-off distinction",
+      "unsupported stronger meaning than answerMeaning.userSupportedMeaning establishes",
     );
   });