diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7a4266e89..acea5eda1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -153,6 +153,9 @@ jobs:
       - name: PR policy self-test
         run: npm run check:pr-policy
 
+      - name: Gate-manifest self-test
+        run: npm run check:gate-manifest
+
       - name: Codebase index coverage
         run: npm run docs:check-index
 
@@ -177,6 +180,20 @@ jobs:
       - name: Brand asset check
         run: npm run brand:check
 
+      # More generated-output drift detectors that were local-only in
+      # verify:cheap — same rationale as the design-system guards above. Without
+      # them a stale site map, therapy index, or design-system contract merged
+      # green because no workflow ran them. The gate-manifest self-test now fails
+      # CI if this list drifts from verify:cheap again.
+      - name: Site map drift
+        run: npm run sitemap:check
+
+      - name: Therapy data index drift
+        run: npm run check:therapy-data-index
+
+      - name: Design-system contract
+        run: npm run check:design-system-contract
+
       # Fails if a SECURITY DEFINER public function is left executable by
       # PUBLIC/anon (privilege-escalation / cross-tenant read surface).
       - name: Function-grant guard
diff --git a/package.json b/package.json
index 979f266b3..7bce24b72 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
     "test:e2e:visual": "node scripts/run-playwright.mjs --config=playwright.visual.config.ts",
     "test:cross-tenant:staging": "node scripts/run-tsx.mjs scripts/test-cross-tenant-staging.ts",
     "verify:cheap": "node scripts/run-heavy.mjs --npm-script verify:cheap:internal",
-    "verify:cheap:internal": "npm run check:runtime && npm run check:github-actions && npm run check:ci-scope && npm run check:ci-triage && npm run check:pr-policy && npm run sitemap:check && npm run docs:check-index && npm run check:knip && npm run check:maintainability-budgets && npm run brand:check && npm run check:therapy-data-index && npm run check:type-scale && npm run check:icon-scale && npm run check:design-system-contract && npm run check:function-grants && npm run check:owner-scope && npm run lint && npm run typecheck && npm run test",
+    "verify:cheap:internal": "npm run check:runtime && npm run check:github-actions && npm run check:ci-scope && npm run check:ci-triage && npm run check:pr-policy && npm run check:gate-manifest && npm run sitemap:check && npm run docs:check-index && npm run check:knip && npm run check:maintainability-budgets && npm run brand:check && npm run check:therapy-data-index && npm run check:type-scale && npm run check:icon-scale && npm run check:design-system-contract && npm run check:function-grants && npm run check:owner-scope && npm run lint && npm run typecheck && npm run test",
     "verify:pr-local": "node scripts/verify-pr-local.mjs",
     "verify:ui": "npm run check:runtime && npm run test:e2e:pr",
     "verify:release": "npm run check:runtime && npm run lint && npm run typecheck && npm run test && npm run build && npm run test:e2e && npm run check:production-readiness && npm run governance:release && npm run eval:quality:release",
@@ -57,6 +57,7 @@
     "check:maintainability-budgets": "node scripts/check-maintainability-budgets.mjs",
     "check:ci-scope": "node scripts/ci-change-scope.mjs --self-test",
     "check:ci-triage": "node scripts/ci-triage.mjs --self-test",
+    "check:gate-manifest": "node scripts/check-gate-manifest.mjs",
     "check:pr-policy": "node scripts/pr-policy.mjs --self-test && node scripts/check-pr-policy-workflow.mjs",
     "check:env-parity": "node scripts/check-env-parity.mjs",
     "sweep:branch-ledger": "node scripts/sweep-branch-ledger.mjs",
diff --git a/scripts/check-gate-manifest.mjs b/scripts/check-gate-manifest.mjs
new file mode 100644
index 000000000..abbfb2a40
--- /dev/null
+++ b/scripts/check-gate-manifest.mjs
@@ -0,0 +1,94 @@
+#!/usr/bin/env node
+// Gate-manifest self-test (maturity L3).
+//
+// Invariant: every static gate in the local `verify:cheap:internal` chain must
+// also run in CI. Without this, a gate added to the local chain can be silently
+// missed in `.github/workflows/ci.yml`, so a regression it would catch merges
+// green because no workflow runs it. This has already happened twice — the
+// `static-pr` job comment records type/icon/brand being promoted after that
+// exact miss, and sitemap/therapy-data-index/design-system-contract were a
+// second instance. This check makes the drift a hard CI failure instead.
+//
+// Direction is one-way on purpose: CI may run MORE than the local chain (e.g.
+// `format:check`, or heavier build/e2e gates in other jobs). It must never run
+// LESS of the local static set.
+import { readFileSync } from "node:fs";
+
+const pkg = JSON.parse(readFileSync("package.json", "utf8"));
+const ci = readFileSync(".github/workflows/ci.yml", "utf8");
+
+const localChain = pkg.scripts?.["verify:cheap:internal"] ?? "";
+const localGates = [...localChain.matchAll(/npm run ([\w:.-]+)/g)].map((m) => m[1]);
+if (localGates.length === 0) {
+  console.error("gate-manifest: could not parse verify:cheap:internal from package.json.");
+  process.exit(1);
+}
+
+// The `npm run <script>` invoked by a real YAML `run:` step, anchored to the
+// field so a comment that merely mentions `run: npm run X` cannot masquerade as
+// an executed gate (which would let the drift check pass after the real step was
+// deleted). Trailing `# comment` on the step line is allowed. Steps in this repo
+// are single-command, so a single capture is sufficient.
+const npmRunScript = (line) => line.match(/^\s*(?:-\s*)?run:\s+npm run ([\w:.-]+)\s*(?:#.*)?$/)?.[1];
+
+// Extract the `run: npm run X` scripts inside a named top-level job (2-space key).
+function jobScripts(name) {
+  const lines = ci.split(/\r?\n/);
+  const start = lines.findIndex((line) => line === `  ${name}:`);
+  if (start === -1) return null;
+  const scripts = [];
+  for (let i = start + 1; i < lines.length; i++) {
+    if (/^  \S/.test(lines[i])) break; // reached the next top-level job
+    const script = npmRunScript(lines[i]);
+    if (script) scripts.push(script);
+  }
+  return scripts;
+}
+
+const staticPr = jobScripts("static-pr");
+if (!staticPr) {
+  console.error("gate-manifest: could not find the `static-pr` job in .github/workflows/ci.yml.");
+  process.exit(1);
+}
+
+// Every `npm run X` anywhere in ci.yml — used to satisfy gates that run in CI
+// under a different job/name than in the local chain.
+const allCiScripts = new Set(ci.split(/\r?\n/).map(npmRunScript).filter(Boolean));
+
+// A local gate whose CI counterpart has a different script name / job.
+const CI_EQUIVALENT = new Map([
+  // `npm run test` locally is the full vitest run; CI enforces it as coverage in
+  // the dedicated `coverage` job, not in static-pr.
+  ["test", "test:coverage"],
+]);
+
+// Local gates that deliberately do NOT run in CI. Empty today; kept as the
+// explicit, reviewed escape hatch so any future exemption is a conscious edit.
+const LOCAL_ONLY = new Set();
+
+const failures = [];
+for (const gate of localGates) {
+  if (LOCAL_ONLY.has(gate)) continue;
+  const equivalent = CI_EQUIVALENT.get(gate);
+  if (equivalent) {
+    if (!allCiScripts.has(equivalent)) {
+      failures.push(`verify:cheap runs "${gate}" (CI counterpart "${equivalent}") but no CI job runs "${equivalent}".`);
+    }
+    continue;
+  }
+  if (!staticPr.includes(gate)) {
+    failures.push(
+      `verify:cheap runs "${gate}" but the static-pr CI job does not — add "- run: npm run ${gate}" to the static-pr job in .github/workflows/ci.yml, or record a mapping/exemption in scripts/check-gate-manifest.mjs.`,
+    );
+  }
+}
+
+if (failures.length > 0) {
+  console.error("Gate-manifest drift — a local verify:cheap gate is not enforced in CI:");
+  for (const failure of failures) console.error(`- ${failure}`);
+  process.exit(1);
+}
+
+console.log(
+  `Gate-manifest OK: all ${localGates.length} verify:cheap gates are enforced in CI (static-pr + mapped jobs).`,
+);