Agent Skills: extract

Extract structured knowledge from source material. Two modes — `extract` (default) for comprehensive atomic claim extraction, and `analyze` for design proposals where one impact-analysis note replaces claim decomposition. A relevance filter ("does this change how we build our project?") applies to all modes. For `extract` mode on domain-relevant sources, skip rate must be below 10%. Triggers on "/extract", "/extract [file]", "extract insights", "mine this", "process this".