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The game builds the content root from the enabled content mods at startup. Loaders that only read the minecraft namespace now also read the content mods' namespaces (from the root's marker file): block loot tables, recipes, blockstates, language files, and the HUD atlas's item sprites. /give and the command registries know the new items and blocks. A block without a blockstate of its own takes its template's, so every state has a model. Adds examples/ruby-content, a folder content mod: a ruby block and a ruby item with recipes, loot, tags, models, textures and names. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>