- Create build.rs at crate root using serde_yaml (build-dep only) to parse
api/openapi.yaml and write compact JSON to $OUT_DIR/openapi.json
- cargo:rerun-if-changed ensures re-conversion only when spec changes
- serde_yaml never enters the Workers or native binary (build-dep only)
- Downstream GET /api/ handler consumes via include_str!(concat!(env!("OUT_DIR"), "/openapi.json"))
Closes ticket 8892d5