//! yah-tower — rule-driven monitor on scryer (Phase 2).
//!
//! This crate holds the rule engine: compiling `TowerRule` predicates to
//! `ScryerFilter` shapes, parsing rules from YAML/JSON, and validating rules
//! before they are loaded. The supervisor (F3), dispatch engine (F4), and
//! trigger families (F5) will live here too when those tickets land.
//!
//! Architecture: `.yah/docs/architecture/A052-yah-tower.md`