test(reasoning): add customer signing followup fixture

tests/fixtures/pre-anchored-product-launch-customer-signing.json

@@ -0,0 +1,126 @@
+{
+  "description": "Deterministic pre-anchored product-launch customer-signing follow-up fixture — represents the confirmed state immediately before the material customer-signing answer.",
+  "scenario": "We are evaluating two product-launch timing options: launching the new software product this year or waiting twelve months.",
+  "unresolved_question": "Which option leaves us better off overall?",
+  "selectedQuestion": {
+    "nodeId": "n_enterprise_customer_signing",
+    "question": "What evidence would clarify whether one prospective enterprise customer will sign if we launch this year?",
+    "reason": "decision"
+  },
+  "graph": {
+    "centralStatement": "We are evaluating two product-launch timing options: launching the new software product this year or waiting twelve months.",
+    "nodes": [
+      {
+        "id": "n_product_launch_state",
+        "label": "Product launch timing consideration",
+        "description": "Current state: the organisation is evaluating whether to launch the new software product this year or wait twelve months.",
+        "kind": "state",
+        "status": "provisional",
+        "confidence": "high",
+        "value": null,
+        "unit": null,
+        "evidenceIds": [],
+        "dependsOn": [],
+        "affects": [],
+        "parentId": null,
+        "childIds": []
+      },
+      {
+        "id": "opt_launch_this_year",
+        "label": "Launch this year",
+        "description": "Launch the new software product this year. Consequences: £1.2M/year expected additional recurring revenue, £300k one-off launch/support cost.",
+        "kind": "option",
+        "status": "known",
+        "confidence": "high",
+        "value": null,
+        "unit": null,
+        "evidenceIds": [],
+        "dependsOn": [],
+        "affects": [],
+        "parentId": null,
+        "childIds": []
+      },
+      {
+        "id": "opt_wait_twelve_months",
+        "label": "Wait twelve months",
+        "description": "Wait twelve months before launching the product. Consequences: avoids the £300k immediate launch/support cost, forgoes approximately £1.2M of first-year revenue.",
+        "kind": "option",
+        "status": "known",
+        "confidence": "high",
+        "value": null,
+        "unit": null,
+        "evidenceIds": [],
+        "dependsOn": [],
+        "affects": [],
+        "parentId": null,
+        "childIds": []
+      },
+      {
+        "id": "n_product_launch_decision",
+        "label": "Which option leaves us better off overall?",
+        "description": "Uncertainty about which of the two product-launch timing options — launch this year or wait twelve months — provides superior net value for the organisation.",
+        "kind": "unknown",
+        "status": "unknown",
+        "confidence": "medium",
+        "value": null,
+        "unit": null,
+        "evidenceIds": [],
+        "dependsOn": [],
+        "affects": [],
+        "parentId": null,
+        "childIds": []
+      },
+      {
+        "id": "n_enterprise_customer_signing",
+        "label": "Prospective enterprise customer signing status",
+        "description": "Unknown whether one prospective enterprise customer will sign if we launch this year, because they account for approximately £700,000 of the £1.2 million expected annual revenue.",
+        "kind": "unknown",
+        "status": "unknown",
+        "confidence": "medium",
+        "value": null,
+        "unit": null,
+        "evidenceIds": [],
+        "dependsOn": [],
+        "affects": [],
+        "parentId": null,
+        "childIds": []
+      }
+    ],
+    "edges": [
+      {
+        "id": "e-opt-launch-to-dec",
+        "fromNodeId": "opt_launch_this_year",
+        "toNodeId": "n_product_launch_decision",
+        "relationship": "contained_in",
+        "confidence": "high",
+        "description": "Launch this year option is a candidate for the product launch decision"
+      },
+      {
+        "id": "e-opt-wait-to-dec",
+        "fromNodeId": "opt_wait_twelve_months",
+        "toNodeId": "n_product_launch_decision",
+        "relationship": "contained_in",
+        "confidence": "high",
+        "description": "Wait twelve months option is a candidate for the product launch decision"
+      },
+      {
+        "id": "e-customer-signing-to-launch-option",
+        "fromNodeId": "n_enterprise_customer_signing",
+        "toNodeId": "opt_launch_this_year",
+        "relationship": "contained_in",
+        "confidence": "high",
+        "description": "Prospective enterprise customer signing status is material to the launch this year option"
+      }
+    ],
+    "activeUnknownNodeId": "n_enterprise_customer_signing",
+    "resolvedNodeIds": [],
+    "currentSummary": "Two product-launch timing options evaluated; net-value comparison unresolved; prospective enterprise customer signing remains the active material uncertainty.",
+    "reasoningState": {
+      "comparabilityStatus": null,
+      "relationshipStatus": null,
+      "relationshipAssessed": false,
+      "contradictionReasoningAllowed": true,
+      "reasoningStages": []
+    }
+  }
+}

tests/reproduce-multi-turn-investigation.harness.test.js

@@ -2,6 +2,11 @@ import { describe, it, expect } from "vitest";
 import fs from "fs";
 import { fileURLToPath } from "url";
 import path from "path";
+import { situationGraphSchema } from "@/lib/graph/schema.js";
+import {
+  validateGraphReferences,
+  detectDuplicateNodeIds,
+} from "@/lib/graph/utils.js";
 
 // ── Load committed decision-options fixture directly (60A.7) ─────────────
 const DECISION_OPTIONS_FIXTURE_PATH = path.resolve(
@@ -10,6 +15,14 @@ const DECISION_OPTIONS_FIXTURE_PATH = path.resolve(
 );
 const DECISION_OPTIONS_FIXTURE = JSON.parse(fs.readFileSync(DECISION_OPTIONS_FIXTURE_PATH, "utf-8"));
 
+const PRODUCT_LAUNCH_CUSTOMER_SIGNING_FIXTURE_PATH = path.resolve(
+  path.dirname(fileURLToPath(import.meta.url)),
+  "fixtures/pre-anchored-product-launch-customer-signing.json",
+);
+const PRODUCT_LAUNCH_CUSTOMER_SIGNING_FIXTURE = JSON.parse(
+  fs.readFileSync(PRODUCT_LAUNCH_CUSTOMER_SIGNING_FIXTURE_PATH, "utf-8"),
+);
+
 /**
  * Synchronous simulator of the pre-anchored update-only mode with a custom fixture.
  * Mirrors what reproduce-multi-turn-investigation.mjs does when FIXTURE_MODE is set
@@ -1372,6 +1385,62 @@ describe("reproduce-multi-turn-investigation harness: one-shot semantics", () =>
   });
 });
 
+describe("pre-anchored product-launch customer-signing fixture", () => {
+  it("parses, validates, preserves identities, and exposes the customer unknown as the active target", () => {
+    const fixture = PRODUCT_LAUNCH_CUSTOMER_SIGNING_FIXTURE;
+    const graph = situationGraphSchema.parse(fixture.graph);
+    const graphReferenceValidation = validateGraphReferences(graph);
+    const duplicateNodeIds = detectDuplicateNodeIds(graph.nodes);
+
+    const decisionNodes = graph.nodes.filter((node) => node.id === "n_product_launch_decision");
+    const launchOptionNodes = graph.nodes.filter((node) => node.id === "opt_launch_this_year");
+    const waitOptionNodes = graph.nodes.filter((node) => node.id === "opt_wait_twelve_months");
+    const customerUnknownNodes = graph.nodes.filter(
+      (node) => node.id === "n_enterprise_customer_signing",
+    );
+    const additionalUnknownIds = graph.nodes
+      .filter(
+        (node) =>
+          node.kind === "unknown" &&
+          ![
+            "n_product_launch_decision",
+            "n_enterprise_customer_signing",
+          ].includes(node.id),
+      )
+      .map((node) => node.id);
+
+    expect(fixture.selectedQuestion?.question).toBe(
+      "What evidence would clarify whether one prospective enterprise customer will sign if we launch this year?",
+    );
+    expect(fixture.selectedQuestion?.nodeId).toBe("n_enterprise_customer_signing");
+
+    expect(decisionNodes).toHaveLength(1);
+    expect(decisionNodes[0].status).toBe("unknown");
+
+    expect(launchOptionNodes).toHaveLength(1);
+    expect(waitOptionNodes).toHaveLength(1);
+
+    expect(customerUnknownNodes).toHaveLength(1);
+    expect(customerUnknownNodes[0].status).toBe("unknown");
+    expect(customerUnknownNodes[0].kind).toBe("unknown");
+
+    expect(additionalUnknownIds).toEqual([]);
+    expect(graphReferenceValidation.valid).toBe(true);
+    expect(duplicateNodeIds).toEqual([]);
+
+    expect(graph.activeUnknownNodeId).toBe("n_enterprise_customer_signing");
+    expect(customerUnknownNodes[0].id).toBe(graph.activeUnknownNodeId);
+
+    const customerLinkage = graph.edges.filter(
+      (edge) =>
+        edge.fromNodeId === "n_enterprise_customer_signing" &&
+        edge.toNodeId === "opt_launch_this_year" &&
+        edge.relationship === "contained_in",
+    );
+    expect(customerLinkage).toHaveLength(1);
+  });
+});
+
 // ── Pre-anchored update-only mode (57J.74) ─────────────
 
 /**