fix: suppress reasoning display in quiet single-query mode

The -Q quiet single-query path suppresses stream_delta_callback and
tool_gen_callback to keep stdout machine-readable, but missed
reasoning_callback. When display.show_reasoning is on (the default),
the reasoning box leaks into stdout before the final response,
corrupting output for automation wrappers and third-party integrations
using --source tool.

Before:
  hermes chat -Q --source tool -q "Reply with exactly: PING_OK"
  ┌─ Reasoning ──────────────────────┐
  The user wants me to reply...
  PING_OK

After:
  PING_OK

cli.py

@@ -21375,9 +21375,11 @@ def main(
                         cli.agent.suppress_status_output = True
                         # Suppress streaming display callbacks so stdout stays
                         # machine-readable (no styled "Hermes" box, no tool-gen
-                        # status lines).  The response is printed once below.
+                        # status lines, no reasoning box).  The response is
+                        # printed once below.
                         cli.agent.stream_delta_callback = None
                         cli.agent.tool_gen_callback = None
+                        cli.agent.reasoning_callback = None
                         try:
                             result = cli.agent.run_conversation(
                                 user_message=effective_query,