fix(tui): resolve startup model aliases statically

- expand short model aliases like sonnet/opus via static catalogs during startup runtime resolution
- keep startup alias resolution network-free and add regression tests in models and tui gateway suites

tests/test_tui_gateway_server.py

@@ -141,6 +141,24 @@ def test_startup_runtime_detects_provider_for_model_env(monkeypatch):
     )
 
 
+def test_startup_runtime_resolves_short_alias_without_network(monkeypatch):
+    monkeypatch.setenv("HERMES_MODEL", "sonnet")
+    monkeypatch.delenv("HERMES_TUI_PROVIDER", raising=False)
+    monkeypatch.delenv("HERMES_INFERENCE_PROVIDER", raising=False)
+    monkeypatch.setattr(server, "_load_cfg", lambda: {"model": {"provider": "auto"}})
+    monkeypatch.setattr(
+        "hermes_cli.models.fetch_openrouter_models",
+        lambda *_args, **_kwargs: (_ for _ in ()).throw(
+            AssertionError("network lookup should not run")
+        ),
+    )
+
+    model, provider = server._resolve_startup_runtime()
+
+    assert provider == "anthropic"
+    assert model.startswith("claude-sonnet")
+
+
 def test_startup_runtime_does_not_call_network_detector(monkeypatch):
     monkeypatch.setenv("HERMES_MODEL", "sonnet")
     monkeypatch.delenv("HERMES_TUI_PROVIDER", raising=False)