test: keep webui CI hermetic offline

webui/runtime_health.py

@@ -217,6 +217,11 @@ def load_runtime_snapshot(
     repo = _repo_root()
     host = _host_from_url(project.remote_host)
     remote = _remote_name_for_host(host)
+    offline_test = (os.environ.get("WEBUI_TEST_OFFLINE") or "").strip() in {
+        "1",
+        "true",
+        "yes",
+    }
     profile = get_profile()
     allowed = profile.get("allowed_operations") or []
     forbidden = profile.get("forbidden_operations") or []
@@ -247,10 +252,20 @@ def load_runtime_snapshot(
             fetch_error=str(exc),
         )
 
-    identity_fn = resolve_username or _resolve_username
+    identity_fn = resolve_username
+    if identity_fn is None:
+        if offline_test:
+            identity_fn = lambda _host: (None, "offline web UI test mode")
+        else:
+            identity_fn = _resolve_username
     username, identity_error = identity_fn(host)
 
-    git_fn = git_sync or _git_sync_status
+    git_fn = git_sync
+    if git_fn is None:
+        if offline_test:
+            git_fn = lambda _repo, _remote, _branch: (None, None, None)
+        else:
+            git_fn = _git_sync_status
     remote_ref = "prgs" if remote == "prgs" else "origin"
     local_sha, remote_sha, behind = git_fn(repo, remote_ref, project.default_branch)
 
@@ -317,4 +332,4 @@ def snapshot_to_dict(snapshot: RuntimeSnapshot) -> dict[str, Any]:
         "schema_hashes": [_hash_row(item) for item in snapshot.schema_hashes],
         "restart_guidance": snapshot.restart_guidance,
         "fetch_error": snapshot.fetch_error,
-    }
+    }