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Scaffold a production-quality SvelteKit prototype with feature-slice architecture, shadcn-svelte components, zod validation, fake auth, and a consistent factory pattern.

Critical Principles

A prototype that only works with perfect data is a lie. Every component that receives data must render a loading skeleton, an error message, and an empty state — not just the list of items.
If it's not in the README, the reviewer will guess. Each feature README must document the public API (props and events the feature exposes outward), not just the component tree.
Fake data is still data. Hard-coded factories must use realistic names, plausible lengths, and diverse content — placeholder text trains reviewers to ignore details that matter.

Step 0: Parse Args

PROTOTYPE_NAME = first non-flag argument
PROTOTYPE_SLUG = slugified PROTOTYPE_NAME (lowercase, hyphens, no special chars)
BG_MODE        = true if --bg present
SILENT         = true if --silent present

ux:prototype

Critical Principles

Step 0: Parse Args