test(tui): fix stale mocks + xdist flakes in TUI test suite

All 61 TUI-related tests green across 3 consecutive xdist runs.

tests/tui_gateway/test_protocol.py:
- rename `get_messages` → `get_messages_as_conversation` on mock DB (method
  was renamed in the real backend, test was still stubbing the old name)
- update tool-message shape expectation: `{role, name, context}` matches
  current `_history_to_messages` output, not the legacy `{role, text}`

tests/hermes_cli/test_tui_resume_flow.py:
- `cmd_chat` grew a first-run provider-gate that bailed to "Run: hermes
  setup" before `_launch_tui` was ever reached; 3 tests stubbed
  `_resolve_last_session` + `_launch_tui` but not the gate
- factored a `main_mod` fixture that stubs `_has_any_provider_configured`,
  reused by all three tests

tests/test_tui_gateway_server.py:
- `test_config_set_personality_resets_history_and_returns_info` was flaky
  under xdist because the real `_write_config_key` touches
  `~/.hermes/config.yaml`, racing with any other worker that writes
  config. Stub it in the test.

run_agent.py

@@ -4365,6 +4365,22 @@ class AIAgent:
                 self._client_log_context(),
             )
             return client
+        if self.provider == "google-gemini-cli" or str(client_kwargs.get("base_url", "")).startswith("cloudcode-pa://"):
+            from agent.gemini_cloudcode_adapter import GeminiCloudCodeClient
+
+            # Strip OpenAI-specific kwargs the Gemini client doesn't accept
+            safe_kwargs = {
+                k: v for k, v in client_kwargs.items()
+                if k in {"api_key", "base_url", "default_headers", "project_id", "timeout"}
+            }
+            client = GeminiCloudCodeClient(**safe_kwargs)
+            logger.info(
+                "Gemini Cloud Code Assist client created (%s, shared=%s) %s",
+                reason,
+                shared,
+                self._client_log_context(),
+            )
+            return client
         client = OpenAI(**client_kwargs)
         logger.info(
             "OpenAI client created (%s, shared=%s) %s",