fix: close presentation review findings

web/apps/console/src/presentation/conclusion/ConclusionScene.test.tsx

@@ -77,17 +77,17 @@ describe("ConclusionScene", () => {
     expect(screen.getByRole("list", { name: "future work layers" })).toHaveAttribute("data-state", "receded");
   });
 
-  it("keeps evidence as a separately identified node after the runtime", () => {
+  it("attaches evidence vertically beneath the typed substrate rather than extending the contribution line", () => {
     render(<ConclusionScene scene={scene} beat={beat("future")} />);
-    const nodes = [...screen.getByLabelText("contribution flow").children];
-    expect(nodes.map((node) => node.getAttribute("data-node-id"))).toEqual([
+    const executionNodes = [...screen.getByLabelText("contribution flow").children]
+      .filter((node) => node.getAttribute("data-evidence-attachment") !== "vertical");
+    expect(executionNodes.map((node) => node.getAttribute("data-node-id"))).toEqual([
       "planner",
       "substrate",
       "runtime",
-      "evidence",
     ]);
-    expect(nodes[2]).toHaveAttribute("data-node-id", "runtime");
-    expect(nodes[3]).toHaveAttribute("data-node-id", "evidence");
+    expect(screen.getByText("Persisted, inspectable evidence").closest("[data-node-id='evidence']"))
+      .toHaveAttribute("data-evidence-attachment", "vertical");
   });
 
   it("marks every future-work icon neutral while substrate stays the sole emphasis", () => {

web/apps/console/src/presentation/conclusion/ConclusionScene.tsx

@@ -4,6 +4,7 @@ import { StageCaption } from "../StageCaption.js";
 import type { SceneBeatDefinition, SceneDefinition } from "../storyboard.js";
 import {
   contributionNodes,
+  evidenceNode,
   futureWorkBranches,
   isConclusionBeatId,
   nonClaims,
@@ -43,9 +44,17 @@ export const ConclusionScene: FC<ConclusionSceneProps> = ({ scene, beat }) => {
             >
               <span className="conclusion-map__node-index">0{index + 1}</span>
               <strong>{node.label}</strong>
-              {node.id === "evidence" && <small>saved traces and receipts</small>}
             </div>
           ))}
+          <div
+            className={`conclusion-map__node conclusion-map__node--${evidenceNode.id}`}
+            data-evidence-attachment="vertical"
+            data-node-id={evidenceNode.id}
+          >
+            <span className="conclusion-map__node-index">04</span>
+            <strong>{evidenceNode.label}</strong>
+            <small>saved traces and receipts</small>
+          </div>
         </div>
 
         <ul

web/apps/console/src/presentation/conclusion/conclusion-model.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from "vitest";
-import { contributionNodes, futureWorkBranches, isConclusionBeatId, nonClaims } from "./conclusion-model.js";
+import { contributionNodes, evidenceNode, futureWorkBranches, isConclusionBeatId, nonClaims } from "./conclusion-model.js";
 
 describe("conclusion model", () => {
   it("defines the stable contribution boundary", () => {
@@ -7,8 +7,8 @@ describe("conclusion model", () => {
       { id: "planner", label: "External planner" },
       { id: "substrate", label: "Typed workflow substrate" },
       { id: "runtime", label: "Deterministic runtime" },
-      { id: "evidence", label: "Persisted, inspectable evidence" },
     ]);
+    expect(evidenceNode).toEqual({ id: "evidence", label: "Persisted, inspectable evidence" });
   });
 
   it("keeps the closing claims bounded", () => {

web/apps/console/src/presentation/conclusion/conclusion-model.ts

@@ -5,9 +5,11 @@ export const contributionNodes = [
   { id: "planner", label: "External planner" },
   { id: "substrate", label: "Typed workflow substrate" },
   { id: "runtime", label: "Deterministic runtime" },
-  { id: "evidence", label: "Persisted, inspectable evidence" },
 ] as const;
 
+// Evidence is attached to the substrate, not another step in the execution line.
+export const evidenceNode = { id: "evidence", label: "Persisted, inspectable evidence" } as const;
+
 export const nonClaims = ["Not a production sandbox", "Not a scheduler", "Not a broad agent benchmark"] as const;
 
 export const futureWorkBranches = [