ab7f0b0650
One lockstep task: 10 byte-exact literal edits (6 lowercase usage: flips, 4 bare closures gain the 'Usage: aura ' prefix, mc built-in gets the program name in both alternatives) + the single casing-sensitive pin flip in cli_run.rs, then build / targeted test / full suite / clippy / grep gates / diff-shape gate / sweep smoke. refs #179