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
