ci: add PR workflow and check task for continuous quality

- Create PR workflow that runs on pull requests
- Add 'mise run check' task combining typecheck, lint (optional), and tests
- Workflow uses mise for tool management and pnpm caching
- Runs typecheck and tests on every PR to catch issues early
- Note: Some existing tests have validation issues to be fixed

Author: Development

.github/workflows/pr.yml

@@ -0,0 +1,49 @@
+name: PR Checks
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  Checks:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: jdx/mise-action@bfb9fa0b029db830a8c570757cee683df207a6c5 # v2.4.0
+        with:
+          experimental: true
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Get pnpm store directory
+        id: pnpm-cache
+        shell: bash
+        run: |
+          echo "STORE_PATH=$(pnpm store path)" >> $GITHUB_OUTPUT
+
+      - name: Setup pnpm cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
+          key: ${{ runner.os }}-pnpm-store-${{ hashFiles('**/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-pnpm-store-
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Run checks
+        run: mise run check

.mise/tasks/check

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+#MISE description="Run typecheck, lint, and tests"
+#MISE depends=["setup"]
+
+set -euo pipefail
+
+echo "🔍 Running checks..."
+echo ""
+
+# TypeCheck
+echo "📝 TypeCheck..."
+tsc -noEmit
+echo "✅ TypeCheck passed"
+echo ""
+
+# Lint
+echo "🎨 Linting..."
+if [ -f ".eslintrc.json" ] || [ -f ".eslintrc.js" ] || [ -f ".eslintrc.yml" ]; then
+  eslint src --ext .ts,.tsx
+  echo "✅ Linting passed"
+else
+  echo "⚠️  ESLint config not found, skipping"
+fi
+echo ""
+
+# Tests
+echo "🧪 Running tests..."
+vitest run
+echo "✅ Tests passed"
+echo ""
+
+echo "✅ All checks passed!"