Release Notes - v0.2.1

`round-core` v0.2.1

Persistence improvements for routing and critical 404 detection bugfix.

Routing Memoization (memo prop): You can now keep routes "alive" in the DOM even when they aren't active.
- Adding memo={true} to a <Route> or <Page> prevents its destruction on navigation.
- Elements are hidden with display: none, preserving Signals, DOM identity, and CSS animations.
- Perfect for stateful views like video players, complex filters, or multi-step forms.
- Includes a global persistence cache so memoized routes survive if the Route component itself is conditionally unmounted by a parent.

Atomic 404 Evaluation: Fixed a race condition where manual URL entry or initial load could trigger an incorrect 404 state.
- Path evaluation is now batched and globalized.
- isNotFound() now waits for the first render pass to complete before reporting a 404, preventing "false negatives" when routes are defined inside conditional blocks.
Identity Preservation: Fixed a bug where recovering nodes from cache would overwrite their _componentInstance, breaking reactive links.