[TST] ENH: enable quantecon AI style checker

.github/workflows/syle-checker.yml

@@ -0,0 +1,20 @@
+name: Style Guide Review (Automatic)
+on:
+  pull_request:
+    paths:
+      - 'lectures/**/*.md'
+jobs:
+  style-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Run style guide checker
+        uses: QuantEcon/meta/.github/actions/style-guide-checker@copilot/fix-204
+        with:
+          style-guide: 'https://github.com/QuantEcon/meta/blob/main/.github/copilot-qe-style-guide.md'
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          openai-api-key: ${{ secrets.OPENAI_API_KEY }}
+          docs: 'lectures'
+          mode: 'pr'

lectures/orth_proj.md

@@ -23,6 +23,8 @@ kernelspec:
 ```{index} single: Orthogonal Projection
 ```
 
+TEST TRIGGER EDIT
+
 ## Overview
 
 Orthogonal projection is a cornerstone of vector space methods, with many diverse applications.