feat: surface new unknowns after graph updates

tests/graph/update-proposal.test.js

@@ -18,6 +18,7 @@ function makeValidProposal(overrides = {}) {
     removedEdgeIds: [],
     resolvedUnknownNodeIds: ["n-unknown"],
     affectedNodeIds: [],
+    selectedQuestion: null,
     ...overrides,
   };
 }
@@ -117,7 +118,34 @@ describe("parseGraphUpdateProposal", () => {
     expect(result.success).toBe(false);
   });
 
-  it("does not invent a next question", () => {
+  it("defaults missing selectedQuestion to null", () => {
+    const result = parseGraphUpdateProposal({
+      addedNodes: [],
+      updatedNodes: [],
+      addedEdges: [],
+      removedEdgeIds: [],
+      resolvedUnknownNodeIds: [],
+      affectedNodeIds: [],
+    });
+    expect(result.success).toBe(true);
+    expect(result.proposal.selectedQuestion).toBeNull();
+  });
+
+  it("parses a valid selectedQuestion", () => {
+    const result = parseGraphUpdateProposal(
+      makeValidProposal({
+        selectedQuestion: {
+          nodeId: "n-follow-up",
+          question: "How should commercial value be defined for this decision?",
+          reason: "A consequential unknown remains unresolved.",
+        },
+      }),
+    );
+    expect(result.success).toBe(true);
+    expect(result.proposal.selectedQuestion?.nodeId).toBe("n-follow-up");
+  });
+
+  it("does not invent a next question field outside the contract", () => {
     const result = parseGraphUpdateProposal(makeValidProposal());
     expect(result.proposal.nextQuestion).toBeUndefined();
   });