async-tasks

Overview ¶

Async tasks — managed background work, safe by construction.

A "fruit search" backed by a deliberately slow lookup. Compare this with the old pattern (see examples/sync-demo): there you keep a `Processing bool`, a hand-rolled `if Processing { return }` re-entry guard, a raw goroutine, and manual Refresh() calls. Here, Task() handles all of that:

• the closure runs OFF the event loop (so it may block), and never touches island fields directly — state changes go back through t.Apply;
• pending/progress bind without an app field via Busy()/Progress();
• WithRestart() cancels an in-flight search when a new one starts.