fix(ci): build workspace dist before typecheck so cross-package .d.ts resolves

Author: theagenticguy

.github/workflows/ci.yml

@@ -28,6 +28,8 @@ jobs:
       - uses: actions/checkout@v6
       - uses: jdx/mise-action@v4
       - run: pnpm install --frozen-lockfile --ignore-scripts
+      - name: Build workspace .d.ts so cross-package types resolve
+        run: pnpm -r build
       - run: pnpm -r exec tsc --noEmit
 
   test: