recsys-pipeline-architect A spec-and-scaffold skill for building composable recommendation, ranking, and feed pipelines. It encodes the six-stage pattern — Source → Hydrator → Filter → Scorer → Selector → SideEffect — popularized by xAI's open-sourced For You algorithm (Apache 2.0). This skill is an independent reimplementation of the pattern (MIT) — no code copied from the original. Upstream: <https://github.com/mturac/recsys-pipeline-architect When to Use - User wants to build any system that picks "the top K items for a user/context" - User asks "how should I rank X" or describes a feed/pe…