mission-loop-change

Change or add a mission loop safely — routing/lanes, schedule and cadence, driver code, plists, and adding a whole new mission. Use when editing tools/launchd/mission-control.sh, any dev.ailang.mission-* plist or mission-*.env, changing a mission's models/fallbacks/interval, porting a fix to the world fork, bootstrapping a new mission loop (e.g. for ailang-parse), or when asked why a mission-loop change "didn't…