Add workbench screenshot capture smoke

backend/tests/test_readiness_gate.py

@@ -58,6 +58,29 @@ def test_demo_cleanup_dry_run_script_is_dry_run_only() -> None:
     assert "project_report_html" in content
 
 
+def test_readiness_gate_checks_workbench_screenshot_capture_syntax() -> None:
+    script = Path(__file__).resolve().parents[2] / "scripts" / "run_readiness_check.sh"
+    content = script.read_text(encoding="utf-8")
+
+    assert "bash -n scripts/capture_workbench_screenshots.sh" in content
+
+
+def test_workbench_screenshot_capture_is_artifact_based_and_non_mutating() -> None:
+    script = Path(__file__).resolve().parents[2] / "scripts" / "capture_workbench_screenshots.sh"
+    content = script.read_text(encoding="utf-8")
+
+    assert "artifacts/screenshots" in content
+    assert "/api/v1/demo/workflow" in content
+    assert "['overview', 'Overview']" in content
+    assert "['system', 'System']" in content
+    assert "workspace-nav-${workspaceKey}" in content
+    assert "manifest.json" in content
+    assert "page.screenshot" in content
+    assert "fullPage: false" in content
+    assert "Playwright is required" in content
+    assert "--apply" not in content
+
+
 def test_readiness_gate_compiles_yolo_preflight_script() -> None:
     script = Path(__file__).resolve().parents[2] / "scripts" / "run_readiness_check.sh"
     content = script.read_text(encoding="utf-8")