//! kei-model-router — model selection for Claude Code Agent spawns.
//!
//! Concern: given an incoming Agent invocation (subagent_type, prompt,
//! task-class DNA), pick the cheapest model in {Haiku 4.5, Sonnet 4.6,
//! Opus 4.7} that meets the empirical quality bar for similar past
//! invocations. Reads from `kei-ledger` posterior, writes back outcomes.
//!
//! Constructor Pattern: each cube under 200 LOC, each function under 30.
//! Cubes assembled here:
//!
//! - `pricing` — verified per-MTok constants (RULE 0.4, 2026-04-30)
//! - `dna_class` — task-class DNA extraction (strip nonce/body suffixes)
//! - `complexity` — τ-estimator (regex+length+role heuristics)
//! - `posterior` — Beta posterior from ledger rows per (task-class, model)
//! - `kernel` — substrate similarity for unseen task classes
//! - `select` — decision rule: argmin cost s.t. P[q ≥ q*] ≥ 1−δ
//! - `escalate` — retry-ladder bookkeeping
//!
//! Distinct from `kei-router` (which handles NL→tool dispatch and
//! generic LLM provider abstraction). This crate's only job is selecting
//! WHICH Claude tier to spawn an Agent on.

pub mod calibrate;
pub mod complexity;
pub mod dna_class;
pub mod escalate;
pub mod kernel;
pub mod posterior;
pub mod pricing;
pub mod select;

pub use complexity::{ComplexityEstimate, Tier};
pub use escalate::{next_after_failure, EscalationDecision, MAX_ESCALATION_DEPTH};
pub use kernel::{similarity, KernelWeights};
pub use posterior::Posterior;
pub use pricing::{
    cost_micro_cents, Model, ModelPricing, HAIKU_45, OPUS_47, OPUS_47_TOKENIZER_OVERHEAD,
    SONNET_46,
};
pub use select::{select, Decision, DecisionInput};