//! Domain Entities
//!
//! Pure domain models without infrastructure dependencies.
//! - Rei (霊): Persistent persona identity
//! - Tei (体): Execution interface with expertise
//! - Memory: Long-term storage
//! - Document: Raw Markdown source (GraphKai)
//! - EmphasisNode: Extracted emphasis for semantic linking
//! - GraphNode/GraphEdge: Knowledge graph entities (GraphKai)
//! - Call: LLM invocation record
//! - Prompt: Prompt templates
//! - Message: Platform integration message
//! - Webhook: Outbound webhook for external actions
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