feat: display agent name alongside label in terminal title and list output

When a label is set (e.g. "bob"), the display becomes "bob (claude-implementer)"
so the agent type is always visible. Affects all three backends (docker,
macos-container, smolmachines) and the `cli.py list active` output.

Closes #243

bot_bottle/cli/list.py

@@ -55,7 +55,7 @@ def cmd_list(argv: list[str]) -> int:
     # Tab-separated keeps the format stable for shell pipelines.
     for b in active:
         services = ",".join(b.services) if b.services else "-"
-        display_name = b.label if b.label else b.agent_name
+        display_name = f"{b.label} ({b.agent_name})" if b.label else b.agent_name
         colored_name = _ansi_label(display_name, b.color)
         print(f"{b.backend_name}\t{b.slug}\t{colored_name}\t{services}")
     return 0