chore: prepare 0.1.0 for crates.io publish

Add LICENSE-MIT and LICENSE-APACHE at workspace root and in each member package so the dual MIT OR Apache-2.0 license ships in the published .crate.

Fill in publish metadata (authors, repository, homepage, readme, keywords, categories) across the workspace and both members.

Add CHANGELOG.md with a 0.1.0 initial release entry.

Fix clippy lints: unused enumerate index, collapsible if, Default impls for TimerTable, SimRadio, and Ctx, use RangeInclusive::contains.

Exclude examples/microwave_tui.rs from the published package. The file stays in-tree but has known unawaited async log futures that need a dedicated pass before it ships.

Apply cargo fmt across the workspace.

CHANGELOG.md

@@ -0,0 +1,43 @@
+# 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).