- Add VALID_ACTION_TYPES literal and action_type/focal_node_id fields to
AIChatMessageRequest schema
- Add tree_id field to AIChatStartRequest schema for editor-embedded sessions
- Update send_message() signature with action_type and focal_node_id params
- Update start_chat_session() signature with tree_id param
- Pass new params through endpoints to service functions
- All new params have defaults so existing behavior is unchanged
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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