Impl Validator

This is a quality gate that other skills call to verify their own work before showing it to you. When something like memory-bridge or daily-update finishes a task, it spawns this as a subagent and passes a structured check block with the goal, artifacts, and specific things to verify. The validator reads files, looks for placeholders and copy-paste errors, checks that required fields exist, and returns a pass/warn/fail verdict. You can also invoke it directly when you want a second opinion on an implementation. It's explicitly not here to be encouraging or check style preferences. It catches the boring mistakes: missing frontmatter, hardcoded paths, logical contradictions, files that don't actually exist.