fix: stabilize runtime follow-up regressions

tests/plugins/uce_demo_smoke.py

@@ -0,0 +1,37 @@
+from pathlib import Path
+
+# The demo pages are not regression suites, but every one of them must at
+# least compile and render: a preprocessor or runtime change that breaks a
+# demo page (e.g. literal text that looks like an entry point) should fail CI.
+
+ERROR_MARKERS = [
+	"uce compile error",
+	"fatal signal during request",
+	"uncaught exception during request",
+]
+
+
+def _repo_root():
+	return Path(__file__).resolve().parents[2]
+
+
+def _make_demo_case(page_path):
+	def run(context):
+		response = context.expect_status(page_path, 200)
+		body_lower = response.text.lower()
+		for marker in ERROR_MARKERS:
+			if marker in body_lower:
+				raise Exception("response body contained error marker %r for %s" % (marker, page_path))
+		return "HTTP 200 without error markers for %s" % page_path
+
+	return run
+
+
+def register(registry):
+	demo_dir = _repo_root() / "site" / "demo"
+	for path in sorted(demo_dir.glob("*.uce")):
+		registry.case(
+			"demo page " + path.name,
+			_make_demo_case("/demo/" + path.name),
+			tags=["http", "smoke", "uce", "demo", "public"],
+		)

tests/plugins/uce_http_smoke.py

@@ -12,7 +12,9 @@ def register(registry):
 	starter_pages = [
 		("starter home", "/examples/uce-starter/", 200, "Stunning Apps"),
 		("starter dashboard", "/examples/uce-starter/?dashboard", 200, "Dashboard"),
+		("starter dashboard ONCE assets reach head", "/examples/uce-starter/?dashboard", 200, "views/dashboard.css"),
 		("starter workspace nested route", "/examples/uce-starter/?workspace/projects", 200, "Workspace"),
+		("starter workspace ONCE assets reach head", "/examples/uce-starter/?workspace/projects", 200, "css/workspace.css"),
 		("starter ajax section", "/examples/uce-starter/?page2-section1", 200, "UCE starter AJAX fragment response"),
 		("starter route traversal blocked", "/examples/uce-starter/?../../../demo/index", 404, "The requested page does not exist."),
 	]

tests/run_network_tests.py

@@ -14,6 +14,12 @@ from dataclasses import asdict, dataclass, field
 from pathlib import Path
 from typing import Callable, Dict, Iterable, List, Optional
 
+# When executed as a script this module is "__main__"; register it under its
+# real name too, so plugins doing `from run_network_tests import TestFailure`
+# get this module instance (and the same TestFailure class) instead of a
+# re-imported copy whose exceptions the runner's except clause cannot catch.
+sys.modules.setdefault("run_network_tests", sys.modules[__name__])
+
 
 @dataclass
 class Target: