refactor(hermes_cli): collapse PATH B step d.5/e gating

hermes_cli/model_switch.py

@@ -1218,20 +1218,16 @@ def _route_from_model_input(st: _Switch) -> Optional[ModelSwitchResult]:
             if matched is not None:
                 st.new_model, resolved_in_current_catalog = matched, True
 
-    # Step d.5 — deliberately NOT gated on ``not is_custom``.
-    config_routed = False
-    if not st.resolved_alias and not resolved_in_current_catalog and st.target_provider == current_provider:
-        config_routed = _route_configured_provider(st)
-        if isinstance(config_routed, ModelSwitchResult):
-            return config_routed
-
-    # Step e
+    # Steps d.5 / e only apply while the request is still unrouted on the current provider.
+    if st.resolved_alias or resolved_in_current_catalog or st.target_provider != current_provider:
+        return None
+    config_routed = _route_configured_provider(st)  # d.5 — deliberately NOT gated on ``not is_custom``
+    if isinstance(config_routed, ModelSwitchResult):
+        return config_routed
     is_custom = (
         current_provider in {"custom", "local"} or current_provider.startswith("custom:")
         or base_url_hostname(st.current_base_url or "") in ("localhost", "127.0.0.1"))
-    if (
-        st.target_provider == current_provider and not is_custom and not st.resolved_alias
-        and not resolved_in_current_catalog and not config_routed):
+    if not config_routed and not is_custom:  # e
         detected = detect_provider_for_model(st.new_model, current_provider)
         if detected:
             st.target_provider, st.new_model = detected