feat(ci): add token drift detection job to CI pipeline

.gitea/workflows/ci.yml

@@ -29,6 +29,30 @@ jobs:
       - name: Test
         run: pnpm test
 
+  token-drift:
+    name: Check design token drift
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    defaults:
+      run:
+        working-directory: /Users/sd9235/code/mygh/learning_ai_common_plat
+    steps:
+      - name: Pull latest
+        run: git pull --ff-only origin main || true
+
+      - name: Regenerate tokens
+        run: npx tsx packages/design-tokens/scripts/generate.ts
+
+      - name: Check for drift
+        run: |
+          if git diff --exit-code packages/design-tokens/generated/; then
+            echo "✅ No token drift detected"
+          else
+            echo "❌ Token drift detected — run 'npx tsx packages/design-tokens/scripts/generate.ts' and commit"
+            git diff packages/design-tokens/generated/
+            exit 1
+          fi
+
   publish-packages:
     name: Publish @bytelyst/* to Gitea npm registry
     runs-on: ubuntu-latest