fix: rename CREW_HERDR_ENABLED to HERDR_ENV
Fixed
- Renamed
CREW_HERDR_ENABLEDtoHERDR_ENV. Same=1gate on herdr dispatch, just a
clearer name —CREW_HERDR_ENABLEDread as crew-afk-specific when herdr dispatch is a
platform-agnostic mode any of the four launchers can turn on.