//! Phase 121: StepTree → Normalized shadow lowering (dev-only)
//!
//! ## Purpose
//!
//! Establish minimal route from StepTree (structure SSOT) to Normalized form,
//! verifying parity with existing router for if-only patterns.
//!
//! ## Scope
//!
//! - **if-only**: Support if statements without loops
//! - **loop rejection**: Reject loops via capability guard
//!
//! ## Design Rules
//!
//! **Input SSOT**:
//! - `StepTree` + `StepTreeContract` (no facts re-analysis)
//! - Lowering decisions based only on contract information
//!
//! **Output**:
//! - `JoinModule` (Normalized dialect)
//! - Or "Normalized-equivalent intermediate" expressed in existing JoinIR types
//!
//! **Execution conditions**:
//! - dev-only: Only runs when `joinir_dev_enabled()` returns true
//! - strict: Only fail-fast on mismatch when `joinir_strict_enabled()` returns true
//!
//! **Prohibitions**:
//! - No fallback: Shadow conversion failure logs reason in dev-only, fail-fast in strict
//! - No direct env reads (must go through `src/config/env/*`)
//! - No hardcoding (no branching on fixture names or variable names)

pub mod builder;
pub mod contracts;
pub mod parity;

pub use builder::StepTreeNormalizedShadowLowererBox;
pub use contracts::{CapabilityCheckResult, UnsupportedCapability};
pub use parity::{MismatchKind, ShadowParityResult};
