@@ -3384,6 +3384,32 @@ jobs:
       - name: Verify type-check coverage
         run: pnpm --dir ui run type-check:coverage
 
+      # objectui's `lockfile-integrity.yml` (objectui#8326), row 19 of the
+      # objectstack#25697 workflow roster, ported by objectstack#26717: a pull
+      # request's `pnpm-lock.yaml` may not give any package a second physical
+      # copy. The script's header has the mechanism and its boundary.
+      #
+      # It lives here because this job already checks out with
+      # `fetch-depth: 0`, so `origin/<base>` and the merge base are in the
+      # clone, and because it runs on every change to `pnpm-lock.yaml` (the
+      # `ui` filter lists it). Before the install on purpose: the gate reads
+      # two text files with Node builtins only, which Lint UI's pre-install
+      # import graph check holds. `pull_request` only, because the gate's
+      # subject is the pull request's delta against its base; a push or queue
+      # run has none of its own.
+      #
+      # ⛔ `continue-on-error` keeps it an ALARM, as objectui ran it: a finding
+      # prints an `::error::` annotation naming the packages on the pull
+      # request and does NOT fail this required job. Making it blocking is a
+      # maintainer decision (`NOT_A_GATE` in `ui/scripts/dependabot-merge-gate.mjs`
+      # says why), not a step edit.
+      - name: check:lockfile-integrity — compare this pull request's lockfile with its merge base
+        if: github.event_name == 'pull_request'
+        continue-on-error: true
+        env:
+          BASE_REF: ${{ github.base_ref }}
+        run: pnpm --dir ui run check:lockfile-integrity --base-ref "origin/${BASE_REF}"
+
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
 
@@ -84,7 +84,6 @@
     "check:merge-queue-head": "node scripts/check-merge-queue-head.mjs --self-test",
     "check:required-check-set": "node scripts/check-required-check-set.mjs --self-test",
     "check:lockfile-integrity": "node scripts/check-lockfile-integrity.mjs",
-    "check:lockfile-dedupe": "node scripts/check-lockfile-dedupe.mjs",
     "merge-queue-head": "node scripts/check-merge-queue-head.mjs",
     "check:pre-install-import-graph": "node scripts/check-pre-install-import-graph.mjs",
     "check:test-path-roots": "node scripts/check-test-path-roots.mjs",
 
@@ -25,6 +25,7 @@ import { fileURLToPath } from 'node:url';
 import { describe, expect, it } from 'vitest';
 import { lockfilePath } from '../workspace-root.mjs';
 
+import { jobBlock, rootCi, rootWorkflow, rootWorkflowFiles, uiRun, withoutComments } from './helpers/root-ci';
 import { NOT_A_GATE, OPTIONAL_CONTEXTS, REQUIRED_CONTEXTS } from '../dependabot-merge-gate.mjs';
 import {
   compareLockfiles,
@@ -38,7 +39,7 @@ const GATE = path.join(repoRoot, 'scripts/check-lockfile-integrity.mjs');
 const LOCKFILE = lockfilePath();
 const realLock = fs.readFileSync(LOCKFILE, 'utf8');
 
-/** The check-run name the workflow's job produces. */
+/** The check-run name objectui's own job produced, the name the Dependabot merge gate classifies. */
 const CHECK_NAME = 'Lockfile Integrity Check';
 
 describe('the gate runs its own self-test', () => {
@@ -191,15 +192,61 @@ describe('cause 2 — a declared dependency forks with no version moving (object
   });
 });
 
-describe('the gate is classified the way the dispatch reserved', () => {
-  // `exists and runs the gate` and `checks out deep enough to have a merge
-  // base` retired with objectstack#25712. They read objectui's
-  // `lockfile-integrity.yml`, which runs nowhere under the monorepo: GitHub
-  // runs the root `.github/workflows/` alone. That workflow is row 19 of the
-  // objectstack#25697 workflow roster, "kept, follow-up port", re-aimed at the
-  // one root `pnpm-lock.yaml`; the port brings both pins back against the root
-  // job that runs the gate.
+describe('the gate is wired into the root CI (objectstack#26717)', () => {
+  // objectui ran it in its own `lockfile-integrity.yml`, which runs nowhere
+  // under the monorepo: GitHub runs the root `.github/workflows/` alone. Row 19
+  // of the objectstack#25697 workflow roster ported it as one step of root
+  // `ci.yml`'s `type-check-ui` job, re-aimed at the one root `pnpm-lock.yaml`.
+  // The two pins objectui kept on its workflow (`exists and runs the gate`,
+  // `checks out deep enough to have a merge base`) read that job now.
+  const JOB = 'type-check-ui';
+  const STEP_NAME = 'check:lockfile-integrity — ';
+  const COMMAND = `${uiRun('check:lockfile-integrity')} --base-ref "origin/\${BASE_REF}"`;
+
+  /** The step's own lines, from its `- name:` to the next step. Throws when it is gone. */
+  function step(): string {
+    const block = withoutComments(jobBlock(rootCi(), JOB));
+    const start = block.indexOf(`- name: ${STEP_NAME}`);
+    if (start === -1) throw new Error(`ci.yml job ${JOB} has no step named ${STEP_NAME}…`);
+    const next = block.indexOf('\n      - ', start + 1);
+    return next === -1 ? block.slice(start) : block.slice(start, next);
+  }
+
+  it('exists and runs the gate against the pull request base', () => {
+    expect(step()).toContain(`run: ${COMMAND}`);
+    expect(step()).toContain('BASE_REF: ${{ github.base_ref }}');
+    expect(step()).toContain("if: github.event_name == 'pull_request'");
+  });
+
+  it('checks out deep enough to have a merge base', () => {
+    // A shallow clone has no merge base, and the script exits 2 rather than
+    // guess one: a reading that never measured the change.
+    const block = withoutComments(jobBlock(rootCi(), JOB));
+    const checkout = block.indexOf('uses: actions/checkout@');
+    expect(checkout).toBeGreaterThan(-1);
+    expect(block.indexOf('fetch-depth: 0', checkout)).toBeGreaterThan(checkout);
+    expect(block.indexOf('fetch-depth: 0', checkout)).toBeLessThan(block.indexOf(`- name: ${STEP_NAME}`));
+  });
 
+  it('⛔ stays an alarm in a required job: continue-on-error, before the install', () => {
+    // The step's finding must not fail Type Check UI; enrolling the gate is
+    // the maintainer's decision (the classification below). Before the
+    // install, because the script needs nothing installed.
+    expect(step()).toContain('continue-on-error: true');
+    const block = withoutComments(jobBlock(rootCi(), JOB));
+    expect(block.indexOf(`- name: ${STEP_NAME}`)).toBeLessThan(block.indexOf('run: pnpm install --frozen-lockfile'));
+  });
+
+  it('runs in that one place: no other root workflow carries it', () => {
+    const carriers = rootWorkflowFiles().filter((file) =>
+      withoutComments(rootWorkflow(file)).includes('check:lockfile-integrity'),
+    );
+    expect(carriers).toEqual(['ci.yml']);
+    expect(withoutComments(rootCi()).split('check:lockfile-integrity').length - 1).toBe(2); // the name and the run
+  });
+});
+
+describe('the gate is classified the way the dispatch reserved', () => {
   it('⛔ is classified as NOT a blocking context (the maintainer floor)', () => {
     expect(Object.keys(NOT_A_GATE)).toContain(CHECK_NAME);
     expect(REQUIRED_CONTEXTS).not.toContain(CHECK_NAME);