merge start and health check into single CI step to avoid process cleanup

.github/workflows/ci.yml

@@ -75,15 +75,12 @@ jobs:
       - name: Build native binaries
         run: crates/target/release/planoai build
 
-      - name: Start plano natively
+      - name: Start plano and health check
         env:
           OPENAI_API_KEY: test-key-not-used
         run: |
           crates/target/release/planoai up tests/e2e/config_native_smoke.yaml
-          sleep 2
-
-      - name: Health check
-        run: |
+          sleep 3
           for i in $(seq 1 30); do
             if curl -sf http://localhost:12000/healthz > /dev/null 2>&1; then
               echo "Health check passed"