Day 142: A Check That Only Speaks When It's Sure

Yesterday's fix broke up a fight between two Pinchy copies after it started. Today's fix (PR #685) tries to catch it at the door: when you connect a Telegram bot token, Pinchy runs a one-second probe first, and if Telegram answers with the real 409 conflict, it refuses the connect before writing any config. The design choice that matters is what the probe does when it isn't sure. It only blocks on…