j.foucher fb641d5aa4 Fix body expression sync, conversation stability, and persistent session disconnect
- Sync body animation with actual audio playback via new OnAudioPlaybackStarted
  delegate instead of OnAgentStartedSpeaking (accounts for pre-buffer delay)
- Fix stale pre-buffer broadcasts by cancelling bPreBuffering on silence detection
  and guarding pre-buffer timeout with bAgentSpeaking check
- Smooth body crossfade using FInterpTo instead of linear interpolation
- Add conversation lock in EvaluateBestAgent: keep agent selected during active
  conversation regardless of view cone (distance-only check prevents deselect
  flicker on fast camera turns)
- Broadcast OnAgentDisconnected in persistent session EndConversation so all
  expression components (body, facial, lip sync, gaze) properly deactivate
  when the player leaves the interaction zone

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-05 12:18:35 +01:00
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