Replace IsEphemeral() with fine-grained properties on WorkerCommandsPartition

Update WorkerCommandsPartition to implement HasTTLExpiry(),
SupportsFairness(), and SupportsVersioning() instead of IsEphemeral().

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: rkannan82

common/tqid/task_queue_id.go

@@ -355,9 +355,9 @@ func (w *WorkerCommandsPartition) IsChild() bool {
 	return false
 }
 
-func (w *WorkerCommandsPartition) IsEphemeral() bool {
-	return true
-}
+func (w *WorkerCommandsPartition) HasTTLExpiry() bool       { return true }
+func (w *WorkerCommandsPartition) SupportsFairness() bool   { return false }
+func (w *WorkerCommandsPartition) SupportsVersioning() bool { return false }
 
 func (w *WorkerCommandsPartition) RpcName() string {
 	return w.name