feat: separate confidence from reasoning completeness

lib/graph/schema.js

@@ -36,6 +36,20 @@ export const ConfidenceLevel = /** @type {const} */ ({
   high: "high",
 });
 
+export const CompletenessStatus = /** @type {const} */ ({
+  empty: "empty",
+  partial: "partial",
+  complete: "complete",
+});
+
+export const confidenceAssessmentSchema = z
+  .object({
+    evidenceConfidence: z.enum(Object.values(ConfidenceLevel)),
+    completenessStatus: z.enum(Object.values(CompletenessStatus)),
+    conclusionConfidence: z.enum(Object.values(ConfidenceLevel)),
+  })
+  .strict();
+
 // ── SituationNode ────────────────────────────────────
 
 export const situationNodeSchema = z.object({
@@ -45,6 +59,7 @@ export const situationNodeSchema = z.object({
   kind: z.enum(Object.values(SituationKind)),
   status: z.enum(Object.values(SituationStatus)),
   confidence: z.enum(Object.values(ConfidenceLevel)),
+  confidenceAssessment: confidenceAssessmentSchema.optional(),
   value: z.union([z.string(), z.number(), z.null()]).nullable().optional(),
   unit: z.string().nullable().optional(),
   evidenceIds: z.array(z.string()).default([]),
@@ -188,6 +203,7 @@ export function makeNode(opts) {
     kind: opts.kind ?? "observation",
     status: opts.status ?? "unknown",
     confidence: opts.confidence ?? "medium",
+    confidenceAssessment: opts.confidenceAssessment,
     value: opts.value ?? null,
     unit: opts.unit ?? null,
     evidenceIds: opts.evidenceIds ?? [],