Build-time converter reads content YAML and emits RON format. Lives in tooling/content-converter/ as standalone Rust crate. Runs via make content-ron. Supports --dry-run, --verbose, --content-type filtering. Not on critical path — engine consumes YAML in v0.1, RON is future- proofing for runtime performance. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>