feat(cfold): canonicalize custom test layout

tests/mumble/custom/test_tcp_health.py

@@ -0,0 +1,26 @@
+"""mumble — TCP health parity port (Phase 2 P2).
+
+SOURCE: recipe-info/mumble/tests/health_check.py — "Confirms the mumble server is listening on
+port 64738 via TCP connection test." The original SSHes to the server and probes localhost:64738;
+here the cc-ci run executes on the cc-ci host (cc-ci-run) and the recipe is deployed with
+compose.host-ports.yml, so 64738 is published on the host — we probe 127.0.0.1:64738 directly.
+"""
+
+from __future__ import annotations
+
+import socket
+import time
+
+
+def test_mumble_listening_on_64738(live_app):
+    """The mumble voice server accepts a TCP connection on 64738 (host-published)."""
+    deadline = time.time() + 60
+    last_err = None
+    while time.time() < deadline:
+        try:
+            with socket.create_connection(("127.0.0.1", 64738), timeout=10):
+                return  # connected — server is listening
+        except OSError as e:  # noqa: PERF203
+            last_err = e
+            time.sleep(3)
+    raise AssertionError(f"mumble not listening on 127.0.0.1:64738 — last error: {last_err}")