//! Background worker infrastructure (#843 Part C).
//!
//! Generic thread pool for off-tick computation. Workers run on dedicated
//! threads, separate from the Bevy tick loop. The tick loop pushes requests
//! (non-blocking) and polls for results (non-blocking).
//!
//! Each worker type is a Bevy `Resource` wrapping a typed `BackgroundWorkerPool`.
//! Systems in `TickPhase::PreInput` poll results; systems in `TickPhase::PostSnapshot`
//! push new requests.
//!
//! ## Determinism (D-010)
//!
//! Workers preserve determinism through request-at-tick, deliver-complete:
//! - Inputs come from the deterministic tick loop (same seed → same requests)
//! - Outputs are deterministic per input (seeded RNG, no external state)
//! - The tick loop never incorporates partial results
//! - The only non-deterministic part is latency (when results arrive)
//!
//! ## Delivery strategies
//!
//! Each request declares how the tick loop handles a not-yet-ready result:
//! - `Fallback`: use default/cached value, player never waits
//! - `GracefulDegrade`: area loads partially, elements pop in when ready
//! - `ModalLock`: tick loop pauses until result arrives (rare, diegetic UI)

pub mod pool;
pub mod stubs;
pub mod systems;