Sub-ticket of MSG-22 hub.mjs:574 isValidAgentName widen ^[a-z0-9][a-z0-9_-]{1,63}$ to allow _ in scrp- sender ids (OPS-13 word-joiner grammar); rides MSG-20/21 batch+restart; verified no _-sensitive hub routing (nw-whey). Blocks bin-whey errscan rename until live. · llmmsg-srv