Optionalprovider: IMetadataProviderThe form the user has open, as the agent context names it
(AdditionalContext.Form). Its full composition snapshot is read from the
FormCompositionRegistry; with no reference, or no such form open, a panel's
placement is worked out from the server's composition instead.
Confirm with the user and apply the spec. Routes to Create / Modify automatically based on whether an Active override already exists.