Mental-model reset for Svelte 5. Use when writing or reviewing Svelte components to shift from "it works" to "thinks in Svelte." Triggers on Svelte code review, "is this idiomatic", "Svelte way", Svelte 5 migration, or smells carried over from React/Vue/Svelte 4 — effect assigns state, prop copied to $state, global store by default, $bindable everywhere, clickable div, createEventDispatcher, export let, on:click, slot-shaped APIs, lifecycle-driven code, imperative DOM wiring, immutable-update ceremony, context value replacement, shadcn-svelte form structure, Field.* components, bits-ui form controls, or component APIs that hide ownership. This is the general-purpose entry point for Svelte component review; delegates to sveltekit for routes/load/actions/server concerns and to focused references for details.