feat: default script task to FEEL expression, business rule task to DMN decision Add CreateZeebeScriptTaskBehavior and CreateZeebeBusinessRuleTaskBehavior to automatically set the default implementation when creating these element types. Matches UX of bpmn:UserTask which defaults to zeebe:UserTask. Related to camunda/camunda-modeler#6015
test(camunda-cloud): verify Call Activity Business ID morph cleanup The Business ID lives on zeebe:CalledElement, which is `allowedIn` bpmn:CallActivity only. Morphing away from a Call Activity therefore drops the extension element (and the Business ID) through core moddle copy - no dedicated behavior is required, consistent with bindingType having no downgrade cleanup either. Adds a regression test covering morph to Task/UserTask/SubProcess for both a value and an empty (null) override. Related to https://github.com/camunda/camunda-modeler/issues/5912 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>