Epic Fight Guard Fix

## Update: diagnostic logging for the no-shield guard-available fallback

**Improved**: the fallback path that forces Epic Fight's guard to "available" for any recognized weapon when no shield is in the offhand (used by the base guard-availability mixins) used to log nothing at all — this is exactly why weapon right-click conflicts (like the wom:napoleon issue fixed in 1.0.23/1.0.24) took a long diagnostic hunt to track down.

Now logs once per player per distinct weapon, right when guardfix is about to force that weapon guard-available: `guardfix-debug.log` will show the weapon's registry name directly, with a reminder to add it to `weaponBlacklist` if its own right-click skill stops responding. No functional change — just makes the next conflict like this immediately visible instead of silent.