fix(ci): use local binary for pipeline smoke test (#1163)

The local smoke test runs npx gsd-pi which fails in the container
because the gsd bin isn't on PATH. Point GSD_SMOKE_BINARY at the
built dist/loader.js directly with an absolute path so smoke tests
work from any cwd.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.github/workflows/pipeline.yml

@@ -56,7 +56,10 @@ jobs:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
 
       - name: Smoke test (local)
-        run: npm run test:smoke
+        run: |
+          chmod +x dist/loader.js
+          export GSD_SMOKE_BINARY="$(pwd)/dist/loader.js"
+          npm run test:smoke
 
   test-verify:
     name: Test & Verify