fix: borrow generateAmendedMessage in CherryPick

lib/cherry_pick.js

@@ -151,3 +151,5 @@ CherryPick.prototype.downloadAndPatch = LandingSession.prototype.downloadAndPatc
 CherryPick.prototype.validateLint = LandingSession.prototype.validateLint;
 CherryPick.prototype.getMessagePath = LandingSession.prototype.getMessagePath;
 CherryPick.prototype.saveMessage = LandingSession.prototype.saveMessage;
+CherryPick.prototype.generateAmendedMessage =
+  LandingSession.prototype.generateAmendedMessage;

test/unit/cherry_pick.test.js

@@ -0,0 +1,48 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert';
+
+import CherryPick from '../../lib/cherry_pick.js';
+
+function stubCli() {
+  return {
+    warn() {},
+    ok() {},
+    log() {},
+    async prompt() { return 'CVE-2026-XXXXX'; }
+  };
+}
+
+describe('CherryPick: prototype wiring', () => {
+  // `amend()` is borrowed from LandingSession and calls
+  // `this.generateAmendedMessage()`, so it must be borrowed too.
+  for (const method of [
+    'downloadAndPatch',
+    'validateLint',
+    'getMessagePath',
+    'saveMessage',
+    'generateAmendedMessage'
+  ]) {
+    it(`borrows ${method} from LandingSession`, () => {
+      assert.strictEqual(typeof CherryPick.prototype[method], 'function');
+    });
+  }
+});
+
+describe('CherryPick: generateAmendedMessage', () => {
+  it('adds the CVE-ID trailer from cveIds during a security cherry-pick', async() => {
+    const cp = new CherryPick(896, process.cwd(), stubCli(), {
+      owner: 'nodejs-private',
+      repo: 'node-private',
+      includeCVE: true,
+      cveIds: ['CVE-2026-58044']
+    });
+    cp.metadata = 'PR-URL: https://github.com/nodejs-private/node-private/pull/896\n' +
+      'Reviewed-By: Robert Nagy <ronagy@icloud.com>';
+
+    const original = 'sqlite: invalidate tag store iterators on statement reset\n\n' +
+      'PR-URL: https://github.com/nodejs/node/pull/123';
+
+    const amended = await cp.generateAmendedMessage(original);
+    assert.match(amended, /CVE-ID: CVE-2026-58044/);
+  });
+});