Add action logging to speakers and agents apps
Speakers app (facet-scoped):
- voiceprint_save: when saving voiceprint to existing entity
- entity_voiceprint_create: when creating entity with voiceprint
Agents app (journal-level):
- agent_create/agent_update: when creating or updating agent definitions
- insight_create/insight_update: when creating or updating insight definitions
- insight_toggle: when toggling insight enabled/disabled state
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>