ci(web): run canvaskit host tests

.github/workflows/rust-check.yml

@@ -74,6 +74,8 @@ jobs:
       # smoke (memory_loop) self-uses the raster fallback instead of
       # hard-failing on EGL init. Real-GPU coverage runs on dev machines.
       - run: cargo test --workspace
+      - name: Run CanvasKit web host tests
+        run: cargo test -p op-host-web --features canvaskit
       - run: cargo clippy --workspace --all-targets -- -D warnings
       # Step 1a Phase C Task 4: spec v19 §11 + §12.3 boundary invariants.
       # Linux runner has the full mobile target stdlib (`rustup target add`

crates/op-host-web/tests/ci_workflow.rs

@@ -0,0 +1,21 @@
+#[test]
+fn rust_check_runs_canvaskit_widget_host_tests() {
+    let workflow = std::fs::read_to_string(concat!(
+        env!("CARGO_MANIFEST_DIR"),
+        "/../../.github/workflows/rust-check.yml"
+    ))
+    .expect("rust-check workflow is readable");
+
+    assert!(
+        workflow.contains("Run CanvasKit web host tests"),
+        "rust-check should name the CanvasKit web host test step"
+    );
+    assert!(
+        workflow.contains("cargo test -p op-host-web"),
+        "rust-check should run op-host-web tests explicitly"
+    );
+    assert!(
+        workflow.contains("--features canvaskit"),
+        "rust-check must enable the production CanvasKit web host feature"
+    );
+}