fix(providers): resolve plugin-registered provider profiles in get_provider

Plugin-only providers (commandcode, tencent-tokenhub, ...) are absent from
models.dev and HERMES_OVERLAYS, so resolve_provider_full returned None and
/model switches failed with "Unknown provider ..." even though the picker
lists them (CANONICAL_PROVIDERS auto-extends from the same registry).

Fall back to providers.get_provider_profile() before giving up, mapping the
profile api_mode to the ProviderDef transport.

hermes_cli/providers.py

@@ -525,6 +525,31 @@ def get_provider(name: str, *, allow_network: bool = True) -> Optional[ProviderD
             source="hermes",
         )
 
+    # Plugin-registered provider profiles (plugins/model-providers/<name>/).
+    # Providers that ship only as plugin profiles (e.g. commandcode,
+    # tencent-tokenhub) are absent from models.dev and HERMES_OVERLAYS, so
+    # without this fallback they resolve as "Unknown provider" in /model,
+    # --provider, and the model-switch path even though the picker lists them
+    # (CANONICAL_PROVIDERS auto-extends from the same plugin registry).
+    try:
+        from providers import get_provider_profile as _profile
+
+        _prof = _profile(canonical)
+        if _prof is not None:
+            _api_mode_to_transport = {v: k for k, v in TRANSPORT_TO_API_MODE.items()}
+            _transport = _api_mode_to_transport.get(_prof.api_mode, "openai_chat")
+            return ProviderDef(
+                id=canonical,
+                name=_prof.display_name or _prof.name or canonical,
+                transport=_transport,
+                api_key_env_vars=tuple(_prof.env_vars or ()),
+                base_url=_prof.base_url or "",
+                auth_type=_prof.auth_type or "api_key",
+                source="plugin-profile",
+            )
+    except Exception:
+        pass
+
     return None
 
 

tests/plugins/model_providers/test_commandcode_profile.py

@@ -256,3 +256,22 @@ class TestCommandCodeFetchModelsPickerContract:
         profile = providers.get_provider_profile(profile_name)
         assert profile is not None
         assert "base_url" in inspect.signature(profile.fetch_models).parameters
+
+    def test_resolve_provider_full(self):
+        """Both profiles must resolve through the model-switch path.
+
+        Regression: ``resolve_provider_full`` only knew models.dev + overlay
+        providers, so plugin-only providers (commandcode) failed with
+        "Unknown provider" on /model switches even though the picker listed
+        them.
+        """
+        from hermes_cli.providers import resolve_provider_full
+
+        chat = resolve_provider_full("commandcode", {}, [])
+        assert chat is not None and chat.id == "commandcode"
+        assert chat.transport == "openai_chat"
+        assert "COMMANDCODE_API_KEY" in chat.api_key_env_vars
+
+        anth = resolve_provider_full("commandcode-anthropic", {}, [])
+        assert anth is not None and anth.id == "commandcode-anthropic"
+        assert anth.transport == "anthropic_messages"