docs: Update README "Help wanted": remove #94, add async siblings (#99, #100, #101)

Author: lxsaah

CHANGELOG.md

@@ -29,6 +29,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- **`hello-mailbox` example (Issue #94)**: New minimal example demonstrating the Mailbox buffer (latest-wins) semantics using the synchronous API. First community contribution from [@ggmaldo](https://github.com/ggmaldo) — see [examples/hello-mailbox/](examples/hello-mailbox/).
 - **Writer-exclusivity validation (Issue #89)**: Combining `.source()`, `.transform()`, and `.link_from()` on the same record now panics at configuration time with a clear message instead of silently producing a last-writer-wins race on the buffer. Multiple `.link_from()` inbound connectors (fan-in) remain allowed. ([aimdb-core](aimdb-core/CHANGELOG.md))
 - **`no_std` Transform API (Design 027)**: `.transform()` and `.transform_join()` are now available on `no_std + alloc` targets — no longer Tokio-only. Multi-input join fan-in moved out of `aimdb-core` into the new `JoinFanInRuntime` traits in `aimdb-executor`, with implementations in the Tokio (`mpsc::channel`, capacity 64), Embassy (`embassy_sync::Channel`, capacity 8), and WASM (`futures_channel::mpsc`, capacity 64) adapters. ([aimdb-core](aimdb-core/CHANGELOG.md), [aimdb-executor](aimdb-executor/CHANGELOG.md), [aimdb-tokio-adapter](aimdb-tokio-adapter/CHANGELOG.md), [aimdb-embassy-adapter](aimdb-embassy-adapter/CHANGELOG.md), [aimdb-wasm-adapter](aimdb-wasm-adapter/CHANGELOG.md))
 - **Task-model join handler**: New `JoinBuilder::on_triggers(FnOnce(JoinEventRx, Producer) -> impl Future)` API replaces the previous callback model. Eliminates per-event heap allocation and lets handler state borrow across `.await` points. **Breaking change** vs. the old `with_state().on_trigger(...)` form — see [aimdb-core](aimdb-core/CHANGELOG.md).

Cargo.lock

@@ -210,10 +210,12 @@ We're a small team building something ambitious. The fastest way to help is to t
 - [#91 — `is_*_error()` predicates for `DbError`](https://github.com/aimdb-dev/aimdb/issues/91) · 1–2h · core
 - [#92 — `no_std` `Display` for `DbError` should include numeric fields](https://github.com/aimdb-dev/aimdb/issues/92) · 2–3h · core · embedded
 - [#93 — Minimal example: `hello-single-latest`](https://github.com/aimdb-dev/aimdb/issues/93) · 2–3h · docs
-- [#94 — Minimal example: `hello-mailbox`](https://github.com/aimdb-dev/aimdb/issues/94) · 2–3h · docs
 - [#95 — CLI: add `aimdb instance ping` subcommand](https://github.com/aimdb-dev/aimdb/issues/95) · 3–4h · cli
 - [#96 — CI: fail on broken rustdoc links](https://github.com/aimdb-dev/aimdb/issues/96) · 1–2h · docs
 - [#97 — Doctests for `BufferCfg` variants](https://github.com/aimdb-dev/aimdb/issues/97) · 2–3h · core · docs
+- [#99 — Async example: `hello-mailbox-async`](https://github.com/aimdb-dev/aimdb/issues/99) · 2–3h · docs
+- [#100 — Async example: `hello-single-latest-async`](https://github.com/aimdb-dev/aimdb/issues/100) · 2–3h · docs
+- [#101 — Async example: `hello-spmc-ring-async`](https://github.com/aimdb-dev/aimdb/issues/101) · 2–3h · docs
 
 [See all good first issues →](https://github.com/aimdb-dev/aimdb/labels/good%20first%20issue)