feat: formulate follow-up questions from graph context

lib/graph/apply-proposal.js

@@ -1,8 +1,8 @@
 import { describeGraph } from "./builder.js";
+import { formulateQuestion } from "./question-formulator.js";
 import { graphUpdateSchema, situationGraphSchema } from "./schema.js";
 import {
   applyGraphUpdate,
-  buildDeterministicQuestionForUnknown,
   detectDuplicateNodeIds,
   findAffectedNodes,
   scoreUnknownCandidate,
@@ -630,17 +630,32 @@ export function applyValidatedProposal({ situationGraph, proposal }) {
   updatedSituationGraph.activeUnknownNodeId = newActiveUnknownNodeId;
   updatedSituationGraph.currentSummary = describeGraph(updatedSituationGraph);
 
+  const selectedNode = deterministicSelection?.nodeId
+    ? updatedSituationGraph.nodes.find(
+        (node) => node.id === deterministicSelection.nodeId,
+      )
+    : null;
+  const formulatedQuestion = selectedNode
+    ? formulateQuestion({
+        node: selectedNode,
+        graph: updatedSituationGraph,
+        context: {
+          resolvedValues: validatedProposal.updatedNodes
+            .map((update) => update.newValue)
+            .filter(
+              (value) => typeof value === "string" && value.trim().length > 0,
+            ),
+        },
+      })
+    : null;
+
   const finalSelectedQuestion = deterministicSelection
     ? {
         nodeId: deterministicSelection.nodeId,
         question:
-          deterministicSelection.question ||
-          buildDeterministicQuestionForUnknown(
-            updatedSituationGraph.nodes.find(
-              (node) => node.id === deterministicSelection.nodeId,
-            ),
-          ),
-        reason: deterministicSelection.reason,
+          formulatedQuestion?.question || deterministicSelection.question,
+        reason: formulatedQuestion?.reason || deterministicSelection.reason,
+        strategy: formulatedQuestion?.strategy,
       }
     : null;