False positive: `FHIR_TASK_INPUT_CODING_SYSTEM_NOT_IN_VALUE_SET` on valid ping Tasks

[khalilmalla95]

Problem

Valid DSF Tasks (ping / pingAutostart) get errors like:

FHIR_TASK_INPUT_CODING_SYSTEM_NOT_IN_VALUE_SET: Task.input.type.coding.system 'http://dsf.dev/fhir/CodeSystem/bpmn-message' 
has no resolvable expected ValueSet context (missing fixedUri and binding.valueSet).

Same for http://dsf.dev/fhir/CodeSystem/ping (e.g. dsf-task-start-ping.xml, dsf-task-start-ping-autostart.xml).

Root cause

In FhirTaskLinter.isSystemAllowedByBinding():

bpmn-message is only skipped when slice != null, although BPMN inputs are already checked in lintInputs(). With cards == null, valid message-name inputs fail anyway.

Expected

No FHIR_TASK_INPUT_CODING_SYSTEM_NOT_IN_VALUE_SET on valid ping Task inputs.

Fix

• Allow bpmn-message in Checking without requiring a resolved slice.