ci(lint): add markdown lint to pre-push hook (#1166)

Add `npm run lint:md` to `.husky/pre-push` so markdown lint errors are
caught locally before push. Fix existing violation in pro-test/README.md
(MD012: multiple consecutive blank lines).

.husky/pre-push

@@ -22,5 +22,8 @@ done
 echo "Running edge function tests..."
 node --test tests/edge-functions.test.mjs || exit 1
 
+echo "Running markdown lint..."
+npm run lint:md || exit 1
+
 echo "Running version sync check..."
 npm run version:check || exit 1

pro-test/README.md

@@ -12,7 +12,6 @@ View your app in AI Studio: https://ai.studio/apps/ef577c64-7776-42d3-bb38-3f0a6
 
 **Prerequisites:**  Node.js
 
-
 1. Install dependencies:
    `npm install`
 2. Set the `GEMINI_API_KEY` in [.env.local](.env.local) to your Gemini API key