Residents of an agricultural enclave in Montgomery County are seething about the little-publicized construction of a Zoroastrian temple in their community, arguing it will overwhelm the quiet, rural haven. Builders broke ground recently on a 200-seat house of worship on Barnesville Road in Boyds — next to the county’s Agricultural Reserve, where development is limited to protect farmland. Some residents said the roar of bulldozers was the first they were alerted to the project.