Lattice

Added

• Added CommandExceptionMappers as the reusable default command failure mapper for plugins that build command registration manually.
• Added LatticeRuntime.COMMAND_EXCEPTION_MAPPER so Paper plugins can customize command failure wording through the runtime service model.
• Added explicit LatticeBuilder helpers for default service registration, intentional service replacement, and service lookup during bootstrap.
• Added standalone descriptor coverage to keep the Paper release jar dependency list intentional.

Changed

• Typed LatticeBuilder service helpers now provide defaults only when a service has not already been supplied.
• Paper bootstrap now creates the default command registrar after plugin customization and passes the configured command exception mapper into it.
• The standalone Paper descriptor no longer declares Junction as an optional dependency; Junction remains available through reflective integration detection when present.
• Public authoring docs now spell out service customization, command feedback ownership, command help ownership, and optional integration checks.

Fixed

• Supplying a custom COMMAND_SERVICE no longer constructs the default Paper command registrar or registers its lifecycle handler as a side effect.
• The standalone descriptor test now fails on accidental optional dependency additions, not just missing expected dependencies.

Compatibility

• Existing strict LatticeBuilder#service(key, service) behavior is unchanged.
• Plugin code that intentionally replaces a service should use replaceService(key, service).
• Plugin code that only needs custom command failure text should prefer commandExceptionMapper(...) instead of replacing the full command service.
• Plugins using Junction integration should check PaperIntegrations.JUNCTION_VARIABLES; declare a plugin dependency only when their own load order requires Junction.