feat(confidence-engine): synthesize understanding from focused findings

components/scenario-form.jsx

@@ -67,6 +67,19 @@ export async function submitAnswerForUpdateCase(
   };
 }
 
+export async function synthesizeFromFindings(fetchImpl, { situationGraph, findings }) {
+  const response = await fetchImpl("/api/cases/synthesis", {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ situationGraph, findings }),
+  });
+
+  return {
+    ok: response.ok,
+    data: await response.json(),
+  };
+}
+
 function normaliseStartResult(data) {
   return {
     ...data,
@@ -320,6 +333,34 @@ export default function ScenarioForm() {
 
       return [...prev, storedContribution];
     });
+
+    // ── Synthesis trigger: once per completed Finding transition ──
+    const newFindingsDelta = deriveFindingsFromContributions([
+      {
+        ...contribution,
+        sequence: (focusedContributions?.length ?? 0) + 1,
+        id: `contrib-${String((focusedContributions?.length ?? 0) + 1).padStart(4, "0")}`,
+      },
+    ]).findings;
+
+    if (newFindingsDelta.length === 0) return;
+
+    const currentGraph = result?.situationGraph;
+    if (!currentGraph) return;
+
+    const completeNextFindings = normalizeFindings([
+      ...(findings ?? []),
+      ...newFindingsDelta,
+    ]);
+
+    void synthesizeFromFindings(fetch, {
+      situationGraph: currentGraph,
+      findings: completeNextFindings,
+    }).then((res) => {
+      if (res.ok && res.data?.currentUnderstanding) {
+        setCurrentUnderstanding(res.data.currentUnderstanding);
+      }
+    });
   }
   const textareaRef = useRef(null);