fix(FN-2360): harden CLI vitest workspace source aliasing

- Convert internal @fusion workspace aliases in packages/cli/vitest.config.ts to exact anchored regex entrypoint mappings
- Preserve subpath-before-root alias order so @fusion/core/gh-cli and @fusion/dashboard/planning resolve correctly
- Add vitest-workspace-resolution regression coverage for alias definitions and ordering
- Simulate clean worktrees by temporarily hiding internal dist/ directories and verify dynamic imports resolve from source

.github/workflows/pr-checks.yml

@@ -0,0 +1,42 @@
+name: PR Checks
+
+on:
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: pr-checks-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  checks:
+    name: Lint, Typecheck, Test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v5
+        with:
+          node-version: "24"
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Install Bun
+        uses: oven-sh/setup-bun@v2
+
+      - name: Lint
+        run: pnpm lint
+
+      - name: Typecheck
+        run: pnpm typecheck
+
+      - name: Test
+        run: pnpm test