Expand WORKER_COMMANDS comment with polling and partition details

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

Author: rkannan82

temporal/api/enums/v1/task_queue.proto

@@ -32,8 +32,9 @@ enum TaskQueueKind {
     // Sticky queues are only for workflow tasks. There are no sticky task queues for activities.
     TASK_QUEUE_KIND_STICKY = 2;
     // A worker-commands task queue is used for server-to-worker communication (e.g. activity
-    // cancellations). These queues are per-worker and only exist for the lifetime of the worker
-    // process.
+    // cancellations). These queues are ephemeral and per-worker-process — they exist only for
+    // the lifetime of the worker process. They have a single partition with no fan-out or
+    // forwarding. Polled via PollNexusTaskQueue.
     TASK_QUEUE_KIND_WORKER_COMMANDS = 3;
 }