feat(cfold): canonicalize custom test layout

tests/bluesky-pds/custom/test_session_auth.py

@@ -0,0 +1,35 @@
+"""bluesky-pds — recipe-specific functional test (Phase 2 P3).
+
+GETs the atproto session endpoint `/xrpc/com.atproto.server.getSession` WITHOUT an auth header.
+Asserts the PDS responds with 401 Unauthorized — proves the auth subsystem is wired correctly:
+- 200 = anonymous access leaked (would be a security bug).
+- 401 = correctly enforced.
+- 404 = route missing (PDS misconfigured).
+- 5xx = backend broken.
+
+Distinguishes "the atproto XRPC server is alive AND its auth contract is enforced" from generic
+HTTP 200 health. Non-vacuous: each non-401 status indicates a different class of defect.
+"""
+
+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_get_session_requires_auth(live_app):
+    """GET /xrpc/com.atproto.server.getSession (no token) → 401."""
+    url = f"https://{live_app}/xrpc/com.atproto.server.getSession"
+    status, body = harness_http.retry_http_get(url, expect_status=401, max_wait=60, interval=3)
+    assert status == 401, (
+        f"GET {url} returned {status}, expected 401 (auth required). "
+        f"200 = anonymous leak; 404 = route missing; 5xx = backend broken. "
+        f"body: {body!r}"
+    )
+    # The XRPC error envelope is JSON with an `error` field per the atproto spec.
+    assert isinstance(body, dict) and body.get(
+        "error"
+    ), f"expected XRPC JSON error envelope; got: {body!r}"