diff --git a/tests/runner-e2e/chat-boundary-fingerprint.test.ts b/tests/runner-e2e/chat-boundary-fingerprint.test.ts
new file mode 100644
index 00000000000..4dadb25378d
--- /dev/null
+++ b/tests/runner-e2e/chat-boundary-fingerprint.test.ts
@@ -0,0 +1,80 @@
+import { createHash } from "node:crypto";
+import { mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import path from "node:path";
+import { afterEach, expect, it } from "vitest";
+import { boundaryScenarioMetadata, chatBoundaryFingerprint } from "./chat-boundary-fingerprint.js";
+import { fingerprintChatDependencyClosure } from "./chat-catalog-fingerprint.js";
+import { findChatCatalogCase } from "./chat-catalog-registry.js";
+import type { MatrixExecution } from "./types.js";
+
+const roots: string[] = [];
+afterEach(() => { for (const root of roots.splice(0)) rmSync(root, { recursive: true, force: true }); });
+const scenario = { id: "access.sign-in", capabilities: ["access/sign-in"], context: "An expired human session.",
+  query: "Sign me back in.", expected_outcome: "Real authorized return after sign-in.", attempts: [] as unknown[] };
+function fixture() {
+  const root = mkdtempSync(path.join(tmpdir(), "boundary-metadata-fingerprint-")); roots.push(root);
+  mkdirSync(path.join(root, "tests/runner-e2e"), { recursive: true });
+  const manifestPath = "tests/runner-e2e/chat-campaign-manifest.json";
+  const write = (file: string, body: string) => writeFileSync(path.join(root, file), body);
+  write("selected.ts", 'import "./dependency.js"; export const load = (name: string) => import(name);');
+  write("dependency.ts", 'export const behavior = "original";');
+  const descriptor = { scenarioId: scenario.id, boundaryTarget: "authenticated-harness" };
+  const manifest = { scenarios: [structuredClone(scenario)], ledger: { completed: 0 } };
+  const fingerprint = () => {
+    write(manifestPath, JSON.stringify(manifest));
+    const frozen = boundaryScenarioMetadata(manifest, descriptor.scenarioId);
+    return fingerprintChatDependencyClosure({ root, entries: ["selected.ts"], selected: { descriptor, scenario: frozen, journeyKind: "browser-boundary" },
+      normalizedMetadata: { [manifestPath]: frozen } });
+  };
+  return { manifest, descriptor, write, fingerprint, manifestPath };
+}
+it("keeps ledger, attempt, result and usage updates out of the selected boundary metadata", () => {
+  const f = fixture(); const before = f.fingerprint();
+  f.manifest.ledger.completed++;
+  f.manifest.scenarios[0]!.attempts.push({ result: { outcome: "failed", evidencePaths: ["retained/result.json"] }, usage: { tokens: 123, costUsd: null } });
+  expect(f.fingerprint().digest).toBe(before.digest);
+  f.manifest.scenarios.push({ ...scenario, id: "unselected.scenario", query: "Unrelated request" });
+  expect(f.fingerprint().digest).toBe(before.digest);
+  expect(before.unknownDynamicImports).toEqual(["selected.ts"]);
+  expect(before.sources.map(row => row.file)).toContain(f.manifestPath);
+});
+it.each(["query", "context", "expected_outcome", "capabilities"] as const)("invalidates selected frozen %s changes", field => {
+  const f = fixture(); const before = f.fingerprint().digest;
+  if (field === "capabilities") f.manifest.scenarios[0]!.capabilities.push("access/changed");
+  else f.manifest.scenarios[0]![field] += " Changed canonical requirement.";
+  expect(f.fingerprint().digest).not.toBe(before);
+});
+it("fails closed for missing, wrong, duplicate or malformed selected canonical identity", () => {
+  expect(() => boundaryScenarioMetadata({}, scenario.id)).toThrow("Missing");
+  expect(() => boundaryScenarioMetadata({ scenarios: [scenario] }, "access.not-the-selected-id")).toThrow("Missing");
+  expect(() => boundaryScenarioMetadata({ scenarios: [{ ...scenario, id: undefined }] }, scenario.id)).toThrow("Missing");
+  expect(() => boundaryScenarioMetadata({ scenarios: [scenario, scenario] }, scenario.id)).toThrow("duplicate");
+  expect(() => boundaryScenarioMetadata({ scenarios: [{ ...scenario, query: null }] }, scenario.id)).toThrow("Invalid");
+});
+it("continues to bind executable bytes, unknown-source closure and selected descriptor identity", () => {
+  const f = fixture(); const before = f.fingerprint().digest;
+  f.write("dependency.ts", 'export const behavior = "changed executable";');
+  expect(f.fingerprint().digest).not.toBe(before);
+  f.write("unknown-runtime.ts", 'export const unknown = "conservatively included";');
+  const withUnknown = f.fingerprint();
+  expect(withUnknown.sources.map(row => row.file)).toContain("unknown-runtime.ts");
+  f.write("unknown-runtime.ts", 'export const unknown = "changed unknown code";');
+  expect(f.fingerprint().digest).not.toBe(withUnknown.digest);
+  const beforeDescriptor = f.fingerprint().digest;
+  f.descriptor.boundaryTarget = "changed-target";
+  expect(f.fingerprint().digest).not.toBe(beforeDescriptor);
+});
+it("wires the actual boundary lane to the selected scenario projection without dropping its closure", () => {
+  const descriptor = findChatCatalogCase("access.sign-in")!;
+  const execution = { id: "offline-sign-in", suite: { id: "chat-features" }, environment: { id: "local" }, requiredCredentials: [] } as unknown as MatrixExecution;
+  const result = chatBoundaryFingerprint(descriptor, execution, {}, { credentialNames: [], referenceNames: [], externalRequirements: [] });
+  const manifest = JSON.parse(readFileSync(new URL("./chat-campaign-manifest.json", import.meta.url), "utf8"));
+  const frozen = boundaryScenarioMetadata(manifest, descriptor.scenarioId);
+  const expected = createHash("sha256").update(JSON.stringify(frozen)).digest("hex");
+  expect(result.sources.find(row => row.file === "tests/runner-e2e/chat-campaign-manifest.json")?.sha256).toBe(expected);
+  expect(result.sources.map(row => row.file)).toEqual(expect.arrayContaining(["tests/runner-e2e/chat-boundary-fingerprint.ts", "tests/runner-e2e/runner.spec.ts", "tests/runner-e2e/launch.ts"]));
+  expect(result.fingerprintKind).toBe("complete-execution-and-oracle-closure");
+  expect(result.unknownDynamicImports.length).toBeGreaterThan(0);
+  expect(() => chatBoundaryFingerprint(descriptor, { ...execution, environment: { id: "daytona" } } as MatrixExecution, {})).toThrow("explicitly selected local browser boundary");
+});
diff --git a/tests/runner-e2e/chat-boundary-fingerprint.ts b/tests/runner-e2e/chat-boundary-fingerprint.ts
index 2e20cb5a8e8..bd5dc45bb9d 100644
--- a/tests/runner-e2e/chat-boundary-fingerprint.ts
+++ b/tests/runner-e2e/chat-boundary-fingerprint.ts
@@ -8,6 +8,21 @@ import { fingerprintChatDependencyClosure } from "./chat-catalog-fingerprint.js"
 import type { ChatCatalogDescriptor } from "./chat-catalog-registry.js";
 import type { MatrixExecution } from "./types.js";
 
+/** The campaign ledger is mutable; only this selected frozen scenario is
+ * definition metadata. Executable sources and unknown closure stay byte-bound.
+ */
+export function boundaryScenarioMetadata(manifest: unknown, scenarioId: string) {
+  const rows = (manifest as { scenarios?: unknown } | null)?.scenarios;
+  if (!scenarioId.trim() || !Array.isArray(rows)) throw new Error(`Missing frozen boundary scenario: ${scenarioId}`);
+  const matches = rows.filter(row => row && typeof row === "object" && row.id === scenarioId);
+  if (matches.length !== 1) throw new Error(`Missing or duplicate frozen boundary scenario: ${scenarioId}`);
+  const { id, capabilities, context, query, expected_outcome } = matches[0];
+  if (!Array.isArray(capabilities) || !capabilities.every(value => typeof value === "string")
+    || [context, query, expected_outcome].some(value => typeof value !== "string" || !value.trim()))
+    throw new Error(`Invalid frozen boundary scenario: ${scenarioId}`);
+  return { id, capabilities, context, query, expected_outcome };
+}
+
 /** Independent boundary lane: never relax assertChatCatalogFingerprintLane. */
 export function chatBoundaryFingerprint(descriptor: ChatCatalogDescriptor, execution: MatrixExecution, env: NodeJS.ProcessEnv = process.env, retainedPrivateInputNames?: ReturnType<typeof chatPrivateInputNameIdentity>) {
   if (descriptor.journeyKind !== "browser-boundary" || execution.environment.id !== "local" || execution.suite.id !== "chat-features")
@@ -30,13 +45,15 @@ export function chatBoundaryFingerprint(descriptor: ChatCatalogDescriptor, execu
       || cliSha256 !== expectedCli || serverSha256 !== expectedServer) throw new Error("Boundary installed CLI/server differ from their declared pins");
     installedIdentity = { version: cliManifest.version, cliSha256, serverSha256 };
   } else if (descriptor.boundaryTarget !== "authenticated-harness") throw new Error("Boundary target identity is undeclared");
+  const scenario = boundaryScenarioMetadata(JSON.parse(readFileSync(new URL("./chat-campaign-manifest.json", import.meta.url), "utf8")), descriptor.scenarioId);
   const root = fileURLToPath(new URL("../../", import.meta.url));
   const result = fingerprintChatDependencyClosure({ root,
     entries: [`tests/runner-e2e/${descriptor.modulePath.slice(2)}`, "tests/runner-e2e/chat-boundary-flow.ts", "tests/runner-e2e/chat-boundary-fingerprint.ts",
       "tests/runner-e2e/runner.spec.ts", "tests/runner-e2e/launch.ts", ...descriptor.sourceFiles.map(file => `tests/runner-e2e/${file}`)],
-    selected: { descriptor, journeyKind: "browser-boundary", executionId: execution.id, privateInputRequirements: chatPrivateInputRequirements(descriptor), privateInputNameIdentity, requiredCredentialNames: execution.requiredCredentials, environment: execution.environment.id, installedIdentity },
+    selected: { descriptor, scenario, journeyKind: "browser-boundary", executionId: execution.id, privateInputRequirements: chatPrivateInputRequirements(descriptor), privateInputNameIdentity, requiredCredentialNames: execution.requiredCredentials, environment: execution.environment.id, installedIdentity },
     selectedDispatchFile: "tests/runner-e2e/chat-catalog-registry.ts",
-    normalizedMetadata: { "tests/runner-e2e/chat-catalog-descriptors.json": descriptor },
+    normalizedMetadata: { "tests/runner-e2e/chat-catalog-descriptors.json": descriptor,
+      "tests/runner-e2e/chat-campaign-manifest.json": scenario },
   });
   return { ...result, privateInputNameIdentity, privateInputRequirements: chatPrivateInputRequirements(descriptor) };
 }