# Changelog

All notable changes to this workspace are documented here. The format
follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and
this project adheres to [Semantic Versioning](https://semver.org/).

## 0.1.0 — 2026-04-22

Initial release.

### Added

- `statechart!` proc macro: declarative Harel-style hierarchical state
  machines with nested states, `entry:` / `exit:` actions, LCA-aware
  transitions, default-child descent, and `terminate` semantics.
- Typed event payload bindings:
  `on(PacketRx { rssi: i16 }) => handler;` expands into a typed handler
  signature, verified at compile time.
- Timer triggers: `on(after Duration::from_secs(5)) => Next;` and
  `on(every Duration::from_millis(100)) => tick;`, tracked in a
  fixed-capacity `TimerTable`.
- `during:` activities (v0.2 semantics): async functions that run
  while a state is on the active path and produce events. Multiple
  concurrent durings on a single state borrow disjoint `&mut` slices of
  the context, enforced by Rust's native split-borrow.
- Runtime: `machine.run().await` races active durings, the external
  event channel, and timer deadlines — one future, cooperative on
  embassy, multi-threaded on tokio.
- Feature gates: `tokio` (std + tokio runtime), `embassy` (no_std +
  embassy-time / embassy-sync). The two features are mutually
  exclusive and enforced via `compile_error!`.
- `no_std` by default; `std` pulled in only via the `tokio` feature.
- `STATE_CHART` const and `dispatch()` helper for introspection.
- Workspace: `hsmc` (library) and `hsmc-macros` (proc-macro front-end)
  both at `0.1.0`.

### Docs

- 320-line `README.md` with quickstart, semantics, and examples.
- Runnable examples: `microwave` and `during_radio` under tokio,
  `embassy_full` under embassy.
- Behavior, hierarchy, during, timer, and payload-binding test suites
  (13 integration tests).