ci: add required checks for PR-only workflow

.github/pull_request_template.md

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+## Summary
+
+- 
+
+## Validation
+
+- [ ] `bun run check`
+- [ ] `bun run typecheck`
+
+## Notes
+
+- 

.github/workflows/check.yml

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+name: Check
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+
+jobs:
+  Check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: 1.3.8
+
+      - name: Install dependencies
+        run: bun install --frozen-lockfile
+
+      - name: Biome check
+        run: bun run check
+
+      - name: TypeScript typecheck
+        run: bun run typecheck

.github/workflows/validate-pr-title.yml

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+name: ValidatePrTitle
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+permissions:
+  pull-requests: read
+
+jobs:
+  ValidatePrTitle:
+    name: ValidatePrTitle
+    runs-on: ubuntu-latest
+    steps:
+      - name: Validate pull request title
+        env:
+          PR_TITLE: ${{ github.event.pull_request.title }}
+        run: |
+          title="${PR_TITLE}"
+          if [ -z "${title// /}" ]; then
+            echo "PR title cannot be empty."
+            exit 1
+          fi
+
+          if [[ "$title" =~ ^[Ww][Ii][Pp]([:\ ]|$) ]]; then
+            echo "PR title cannot start with WIP."
+            exit 1
+          fi
+
+          echo "PR title is valid: $title"