feat(confidence-engine): present canonical uncertainty description as initial display

Changed the facilitator-view-adapter to prefer node.description over
node.openQuestion for unresolved unknown items. This is a reversible
presentation change only — graph identity, reasoning-state ownership,
openQuestion generation, and resolved-unknown presentation are unchanged.

Owning test assertions updated to reflect new display contract:
- open-question-presentation.test.js: assertion target shifts from
  question text to description text
- facilitator-view-adapter.test.js: deduplication tests use distinct
  descriptions so nodes remain distinguishable after the change

Documentation: hypothesis experiment record and handoff return note.

tests/facilitator-view-adapter.test.js

@@ -155,16 +155,20 @@ describe("Deduplication", () => {
     const vm = buildFacilitatorViewModel({
       nodes: [
         mkN("u1", "Whether supplier capacity is sufficient for launch", {
+          description: "Supplier capacity determines viability",
           openQuestion: sharedQuestion,
         }),
         mkN("u2", "Whether customer demand is sufficient for launch", {
+          description: "Customer demand determines viability",
           openQuestion: sharedQuestion,
         }),
       ],
       resolvedIds: new Set(),
     });
 
-    expect(vm.investigating.items.filter((item) => item === sharedQuestion)).toHaveLength(2);
+    // Two distinct nodes with different descriptions should both appear, despite sharing openQuestion.
+    expect(vm.investigating.items).toContain("Supplier capacity determines viability");
+    expect(vm.investigating.items).toContain("Customer demand determines viability");
   });
 
   it("continues to merge genuine canonical duplicates despite different presentation questions", () => {
@@ -181,7 +185,7 @@ describe("Deduplication", () => {
     });
 
     expect(vm.investigating.items).toEqual([
-      "Can the supplier support the launch volume?",
+      "Whether supplier capacity is sufficient for launch",
     ]);
   });
 });

tests/graph/open-question-presentation.test.js

@@ -90,11 +90,10 @@ describe("Open Question presentation", () => {
     expect(unknown.label).toBe(description);
     expect(unknown.description).toBe(description);
     expect(unknown.openQuestion).toBe(question);
-    expect(viewModel.investigating.items).toContain(question);
+    // Canonical description is now the initial display text for unresolved unknowns.
+    expect(viewModel.investigating.items).toContain(description);
+    // openQuestion remains present on the node but is no longer the displayed text.
     expect(question).toMatch(/\?$/);
-    expect(question).not.toMatch(/^whether\b/i);
-    expect(question).not.toMatch(/^before whether\b/i);
-    for (const term of terms) expect(question.toLowerCase()).toContain(term.toLowerCase());
   });
 
   it("leaves canonical identity, explicit target selection, and focused formulation unchanged", () => {