fix(cli): update TUI status bar model name on provider fallback

The status bar reads self.model from the CLI class, which is set once
at init and never updated when _try_activate_fallback() switches to a
backup provider/model in run_agent.py. This causes the TUI to display
the original model name while context_length_max changes, creating a
confusing mismatch.

Read the model name from agent.model (live, updated by fallback) with
self.model as fallback before the agent is created. Remove the
redundant getattr(self, 'agent') call that was already done above.

cli.py

@@ -1603,7 +1603,12 @@ class HermesCLI:
         return f"[{('█' * filled) + ('░' * max(0, width - filled))}]"
 
     def _get_status_bar_snapshot(self) -> Dict[str, Any]:
-        model_name = self.model or "unknown"
+        # Prefer the agent's model name — it updates on fallback.
+        # self.model reflects the originally configured model and never
+        # changes mid-session, so the TUI would show a stale name after
+        # _try_activate_fallback() switches provider/model.
+        agent = getattr(self, "agent", None)
+        model_name = (getattr(agent, "model", None) or self.model or "unknown")
         model_short = model_name.split("/")[-1] if "/" in model_name else model_name
         if model_short.endswith(".gguf"):
             model_short = model_short[:-5]
@@ -1629,7 +1634,6 @@ class HermesCLI:
             "compressions": 0,
         }
 
-        agent = getattr(self, "agent", None)
         if not agent:
             return snapshot