Replace config's AJV/json2ts pipeline with authored TypeBox schemas, inferred types, and one generated editor schema. Migrate presence-based auth and explicit AI provider/key contracts with their callers. Core retains AJV. Refs #78
Replace config's AJV/json2ts pipeline with authored TypeBox schemas, inferred types, and one generated editor schema. Migrate presence-based auth and explicit AI provider/key contracts with their callers. Core retains AJV. Refs #78