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//! # Specifications (SpecDD)
//!
//! Formal specifications for domain behavior.
//!
//! ## SpecDD Principles
//!
//! - Document invariants
//! - Define preconditions and postconditions
//! - Specify error conditions
/// Command Cache Specification
///
/// ## Invariants
/// - Lock count <= 64 (slot limit)
/// - Lock is unique per cmd_hash
/// - PID is valid (> 0) when lock held
///
/// ## Operations
/// - acquire(cmd_hash, pid) -> Result<()>
/// - release(cmd_hash, pid) -> Result<()>
/// - get(cmd_hash) -> Option<CommandLock>
///
/// ## Properties
/// - P1: acquire(A, P) succeeds implies get(A) == Some(Lock{pid=P})
/// - P2: release(A, P) succeeds implies get(A) != Some(Lock{pid=P})
/// - P3: acquire(A, P) fails if get(A) == Some(Lock{pid=Q}) && Q != P
/// Circuit Breaker Specification
///
/// ## States
/// - CLOSED: Normal operation, requests flow through
/// - OPEN: Circuit tripped, requests rejected
/// - HALF_OPEN: Testing recovery
///
/// ## Transitions
/// - CLOSED -> OPEN: failures >= threshold
/// - OPEN -> HALF_OPEN: timeout elapsed
/// - HALF_OPEN -> CLOSED: success
/// - HALF_OPEN -> OPEN: failure
/// Health Score Specification
///
/// ## Invariants
/// - All component scores are in [0.0, 1.0]
/// - Overall score is average of components
///
/// ## Thresholds
/// - Healthy: overall >= 0.8
/// - Degraded: 0.5 <= overall < 0.8
/// - Unhealthy: overall < 0.5