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Introduces FeedEngine that consumes FeedSource instances and manages the dependency graph for context flow and item collection. - Validates dependency graph (missing deps, circular references) - Topologically sorts sources for execution order - Runs fetchContext() in dependency order, accumulating context - Runs fetchItems() on all sources with final context - Supports reactive updates via onContextUpdate/onItemsUpdate - Graceful error handling (continues after source failures) Marks DataSource, ContextProvider, ContextBridge, Reconciler, and FeedController as deprecated in favor of FeedSource + FeedEngine. Co-authored-by: Ona <no-reply@ona.com>