BattleTech unit administration

The wizard-only @mech command administers the BattleTech unit containing the wizard. Its switches validate their complete input before changing that unit.

@mech/setarmor accepts a location and zero to three supplied values. Each value must be an integer from 0 through 255, and rear armor is restricted to locations that support it. A rejected command leaves every armor field unchanged.

@mech/repair validates the exact argument count for its selected repair type and rejects unknown types before applying a repair. @mech/restock only accepts a live ammunition critical slot. @mech/delinftech applies only to battle armor.

Speed switches reject negative and non-finite values. Integer switches validate their ranges rather than accepting out-of-range input. These rules require no server configuration.