feat(cfold): canonicalize custom test layout

tests/discourse/custom/test_health_check.py

@@ -0,0 +1,20 @@
+"""discourse — health/readiness functional test (Phase 2).
+
+SOURCE: no recipe-maintainer corpus exists for discourse (P2 vacuous — see PARITY.md). This is a
+Phase-2 health check aligned with the parity-port convention: /srv/status returns 200 only once the
+Rails app is actually serving (the recipe's HEALTH_PATH and the canonical "is discourse up" signal).
+"""
+
+from __future__ import annotations
+
+import os
+import sys
+
+sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "..", "runner"))
+from harness import http as harness_http  # noqa: E402
+
+
+def test_discourse_srv_status_ok(live_app):
+    url = f"https://{live_app}/srv/status"
+    status, _ = harness_http.retry_http_get(url, expect_status=200, max_wait=120, interval=5)
+    assert status == 200, f"GET {url} HTTP {status} (expected 200 — discourse not serving)"