ci(license): add License Headers workflow (ref #81)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.github/workflows/license-check.yml

@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: LicenseRef-CMSD-1.0
+# Copyright (c) 2026 CyberMind — Gérald Kerma <devel@cybermind.fr>
+# Source-Disclosed License — All rights reserved except as expressly granted.
+# See LICENCE-CMSD-1.0.md for terms.
+
+name: License Headers
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - name: Verify CMSD-1.0 headers
+        run: python3 scripts/license-headers.py --check

scripts/license-headers-enrolled.txt

@@ -5,3 +5,4 @@
 # Phase C: this file is deleted; CI then enforces repo-wide.
 scripts/license-headers.py
 tests/test_license_headers.py
+.github/workflows/license-check.yml