Added #

• First release of rune_http. RuneHttpView fetches a Rune source string from a URL, caches it with a configurable TTL, and renders through an inner RuneView. Unlocks the server-driven-UI flow: host app depends on rune_http + rune and mounts RuneHttpView(url: ...) at the screen root.
• Offline-first rendering. If a cached entry exists for the URL, the first frame shows it immediately; a background fetch runs if the entry has exceeded cacheDuration. When the network fails, the cached copy keeps serving.
• Pluggable cache and fetcher. RuneSourceCache + InMemoryRuneSourceCache (default, process-wide) and RuneSourceFetcher + HttpRuneSourceFetcher (default, package:http-backed) are small interfaces that hosts can replace for persistent caching, auth headers, or test fakes.
• Imperative refresh via GlobalKey<RuneHttpViewState>() and state.refresh().
• 16 unit + widget tests cover CachedRuneSource.isFresh, in-memory cache round-trip + invalidation + clear, fetcher success/failure mapping, widget-tree happy-path rendering, cache-first on subsequent mount, stale-while-revalidate, error-view rendering with Retry, and cache-wins-when-fetch-fails.