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.

hermes_cli/models.py

@@ -136,6 +136,11 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "gemma-4-31b-it",
         "gemma-4-26b-it",
     ],
+    "google-gemini-cli": [
+        "gemini-2.5-pro",
+        "gemini-2.5-flash",
+        "gemini-2.5-flash-lite",
+    ],
     "zai": [
         "glm-5.1",
         "glm-5",
@@ -244,6 +249,7 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "big-pickle",
     ],
     "opencode-go": [
+        "glm-5.1",
         "glm-5",
         "kimi-k2.5",
         "mimo-v2-pro",
@@ -534,6 +540,7 @@ CANONICAL_PROVIDERS: list[ProviderEntry] = [
     ProviderEntry("copilot-acp",    "GitHub Copilot ACP",       "GitHub Copilot ACP (spawns `copilot --acp --stdio`)"),
     ProviderEntry("huggingface",    "Hugging Face",             "Hugging Face Inference Providers (20+ open models)"),
     ProviderEntry("gemini",         "Google AI Studio",         "Google AI Studio (Gemini models — OpenAI-compatible endpoint)"),
+    ProviderEntry("google-gemini-cli", "Google Gemini (OAuth)",   "Google Gemini via OAuth + Code Assist (free tier supported; no API key needed)"),
     ProviderEntry("deepseek",       "DeepSeek",                 "DeepSeek (DeepSeek-V3, R1, coder — direct API)"),
     ProviderEntry("xai",            "xAI",                      "xAI (Grok models — direct API)"),
     ProviderEntry("zai",            "Z.AI / GLM",               "Z.AI / GLM (Zhipu AI direct API)"),
@@ -596,6 +603,8 @@ _PROVIDER_ALIASES = {
     "qwen": "alibaba",
     "alibaba-cloud": "alibaba",
     "qwen-portal": "qwen-oauth",
+    "gemini-cli": "google-gemini-cli",
+    "gemini-oauth": "google-gemini-cli",
     "hf": "huggingface",
     "hugging-face": "huggingface",
     "huggingface-hub": "huggingface",