diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 1df4abb..6f6c95f 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -24,6 +24,25 @@ jobs:
       extension_config_path: config/extension.json
       test_contract_path: config/test-contract.json
 
+  # Stable branch-protection context independent of PG14/PG19 matrix churn.
+  # This result requires the ENTIRE maintained-major reusable Windows build.
+  # No Release/dispatch/publish operations occur in this job.
+  windows_required:
+    name: Windows required summary
+    if: ${{ always() && !startsWith(github.ref, 'refs/heads/release/') }}
+    needs: windows
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - name: Test required Windows aggregate allow/deny contract
+        run: python3 tests/test_required_windows_summary.py
+      - name: Require full maintained-PG Windows matrix success
+        env:
+          WINDOWS_MATRIX_RESULT: ${{ needs.windows.result }}
+        run: python3 scripts/required_windows_summary.py
+
   candidate_report:
     name: Verify candidate Windows matrix and immutable artifacts
     if: ${{ always() && github.event_name == 'workflow_dispatch' && startsWith(github.ref, 'refs/heads/auto-candidate/') }}
diff --git a/scripts/required_windows_summary.py b/scripts/required_windows_summary.py
new file mode 100644
index 0000000..f4b2c36
--- /dev/null
+++ b/scripts/required_windows_summary.py
@@ -0,0 +1,27 @@
+#!/usr/bin/env python3
+"""Fail-closed, fixed-name Windows required CI result for maintained-PG matrix.
+
+Never publishes or dispatches. Relies only on GitHub Actions 'needs.windows.result'
+for the COMPLETE reusable Windows matrix (not on volatile per-PG job names).
+"""
+from __future__ import annotations
+import os
+import sys
+
+
+def verified_matrix_result(value):
+    return type(value) is str and value == "success"
+
+
+def main():
+    if not verified_matrix_result(os.environ.get("WINDOWS_MATRIX_RESULT")):
+        print("WINDOWS REQUIRED SUMMARY DENIED: full maintained-PG Windows matrix "
+              "was not successful", file=sys.stderr)
+        return 2
+    print("WINDOWS REQUIRED SUMMARY VERIFIED: full maintained-PG Windows matrix "
+          "completed successfully")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())
diff --git a/tests/test_required_windows_summary.py b/tests/test_required_windows_summary.py
new file mode 100644
index 0000000..088ed92
--- /dev/null
+++ b/tests/test_required_windows_summary.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+"""Test the exact stable aggregate check used by Windows CI, without Release."""
+import importlib.util
+from pathlib import Path
+import os
+import subprocess
+import sys
+import unittest
+
+ROOT = Path(__file__).resolve().parents[1]
+spec = importlib.util.spec_from_file_location(
+    "summary", ROOT / "scripts" / "required_windows_summary.py")
+module = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(module)
+
+
+class WindowsSummaryTests(unittest.TestCase):
+    def test_success_only(self):
+        self.assertTrue(module.verified_matrix_result("success"))
+        for value in ("failure", "cancelled", "skipped", "", "Success",
+                      "success ", True, 1, None):
+            with self.subTest(value=value):
+                self.assertFalse(module.verified_matrix_result(value))
+
+    def test_real_exit_status_allow_and_deny(self):
+        path = ROOT / "scripts" / "required_windows_summary.py"
+        for value, expected in (("success", 0), ("failure", 2),
+                                ("cancelled", 2), ("skipped", 2), ("", 2)):
+            env = dict(os.environ, WINDOWS_MATRIX_RESULT=value)
+            res = subprocess.run([sys.executable, str(path)], env=env,
+                                 capture_output=True, text=True)
+            with self.subTest(result=value):
+                self.assertEqual(res.returncode, expected)
+
+    def test_workflow_depends_on_complete_reusable_matrix_not_pg14_name(self):
+        contents = (ROOT / ".github" / "workflows" / "windows.yml").read_text()
+        self.assertIn("  windows_required:", contents)
+        summary = contents.split("  windows_required:", 1)[1].split(
+            "\n  candidate_report:", 1)[0]
+        self.assertIn("name: Windows required summary", summary)
+        self.assertIn("needs: windows", summary)
+        self.assertIn("always()", summary)
+        self.assertIn("needs.windows.result", summary)
+        self.assertIn("scripts/required_windows_summary.py", summary)
+        self.assertNotIn("PostgreSQL 14", summary)
+        self.assertNotIn("workflow_dispatch:", summary)
+
+
+if __name__ == "__main__":
+    unittest.main()