ci: add PR health check and semantic validation workflows

Add GitHub Actions workflows for pull request CI:
- check-pull-request-health.yml: runs types, lint, test, and build
- check-semantic-pull-request.yml: validates conventional commit format

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: frankieyan

.github/workflows/check-pull-request-health.yml

@@ -0,0 +1,24 @@
+name: Check pull request health
+
+on: pull_request
+
+jobs:
+    build-and-test:
+        runs-on: ubuntu-latest
+        timeout-minutes: 10
+        steps:
+            - name: Checkout repository
+              uses: actions/checkout@v5
+
+            - name: Prepare Node.js environment
+              uses: actions/setup-node@v6
+              with:
+                  cache: npm
+                  node-version-file: .node-version
+
+            - name: Install project npm dependencies
+              run: npm ci
+
+            - run: npm run check
+            - run: npm run test
+            - run: npm run build

.github/workflows/check-semantic-pull-request.yml

@@ -0,0 +1,22 @@
+name: Semantic Pull Request
+
+on:
+    pull_request:
+        types:
+            - edited
+            - opened
+            - synchronize
+
+jobs:
+    validate-title:
+        name: Validate Title
+        runs-on: ubuntu-latest
+
+        env:
+            GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        timeout-minutes: 5
+        steps:
+            - name: Validate pull request title
+              uses: amannn/action-semantic-pull-request@0723387faaf9b38adef4775cd42cfd5155ed6017
+              with:
+                  validateSingleCommit: true