- Brain persona now prefixes every reply with one bracketed emotion tag (e.g. [반가움], [궁금]) and keeps replies to one or two short sentences. - Empty/unrecognised audio (silence/noise) is reported as reply "[잡음]" with no TTS playback instead of an empty reply. - TTS speaks the bracketed emotion too: "[힘차게] 안녕!" is synthesised as "힘차게, 안녕!" via a leading-tag -> spoken-word transform. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>