feat(confidence-engine): tighten focused relationship attribution

tests/graph/focused-investigation-boundaries.test.js

@@ -118,6 +118,52 @@ describe("buildFocusedDeconstructPrompt", () => {
   });
 });
 
+describe("buildFocusedDeconstructPrompt — relationship rule boundary lock", () => {
+  it("relationship instruction explicitly prohibits observation restatement", () => {
+    const prompt = buildFocusedDeconstructPrompt({
+      targetLabel: "X",
+      targetDescription: "Y",
+      centralStatement: "Z",
+      question: "Q?",
+      answer: "A.",
+    });
+    expect(prompt).toContain("Do not create a relationship by merely restating");
+  });
+
+  it("relationship instruction explicitly prohibits promotion of tentative/conditional meaning", () => {
+    const prompt = buildFocusedDeconstructPrompt({
+      targetLabel: "X",
+      targetDescription: "Y",
+      centralStatement: "Z",
+      question: "Q?",
+      answer: "A.",
+    });
+    expect(prompt).toContain("Tentative, speculative, or conditional language must not be promoted into an established relationship");
+  });
+
+  it("relationship instruction requires direct link between two distinct propositions", () => {
+    const prompt = buildFocusedDeconstructPrompt({
+      targetLabel: "X",
+      targetDescription: "Y",
+      centralStatement: "Z",
+      question: "Q?",
+      answer: "A.",
+    });
+    expect(prompt).toContain("must connect two distinct propositions that the user's answer itself links");
+  });
+
+  it("relationship instruction explicitly permits relationships: [] when no direct link exists", () => {
+    const prompt = buildFocusedDeconstructPrompt({
+      targetLabel: "X",
+      targetDescription: "Y",
+      centralStatement: "Z",
+      question: "Q?",
+      answer: "A.",
+    });
+    expect(prompt).toContain("relationships: []");
+  });
+});
+
 describe("validateFocusedDeconstructSchema", () => {
   it("passes when all required fields are present", () => {
     const result = { targetNodeId: "a", observations: [], uncertainties: [], assumptions: [], relationships: [], possibleFollowUpQuestions: [] };