fix: stop voice thread accumulation across REPL turns

The voice listener was being stopped/started on every agent run,
creating a new thread each time. This caused threads to accumulate
across turns, especially after each final_answer.

Fix: remove the stop/start around agent.run(). The voice listener
now runs continuously; stale audio captured during agent execution
is already discarded by the existing queue drain in get_input().

Model: claude-sonnet-4.6
Co-Authored-By: bpsa2 <241537330+bpsa2@users.noreply.github.com>

Author: joaopauloschuler

src/smolagents/bp_cli.py

@@ -2088,8 +2088,6 @@ def get_input():
             else:
                 agent.logger.level = LogLevel.ERROR
             _spinner.start()
-            if _voice_listener is not None:
-                _voice_listener.stop()
             last_prompt = text
             task_text = prepend_instructions(text, instructions) if first_turn else text
             first_turn = False
@@ -2102,8 +2100,6 @@ def get_input():
                 pending_shell_outputs.clear()
             result = agent.run(task_text, reset=False)
             _spinner.stop()
-            if _voice_listener is not None:
-                _voice_listener.start()
             elapsed = time.time() - start_time
 
             # Calculate token usage for this turn
@@ -2136,13 +2132,9 @@ def get_input():
 
         except KeyboardInterrupt:
             _spinner.stop()
-            if _voice_listener is not None:
-                _voice_listener.start()
             console.print("\n[yellow]Interrupted.[/]")
         except Exception as e:
             _spinner.stop()
-            if _voice_listener is not None:
-                _voice_listener.start()
             from smolagents.utils import AgentExecutionRejected
             if isinstance(e, AgentExecutionRejected):
                 console.print("\n[yellow]Execution rejected by user.[/]")