Rename shutdown_worker_rejected to completed_by_worker_shutdown

Aligns the field name with the ShutdownWorker capability name and
removes ambiguity from the old name.

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

Author: rkannan82

temporal/api/workflowservice/v1/request_response.proto

@@ -338,10 +338,13 @@ message PollWorkflowTaskQueueResponse {
     repeated temporal.api.protocol.v1.Message messages = 15;
     // Server-advised information the SDK may use to adjust its poller count.
     temporal.api.taskqueue.v1.PollerScalingDecision poller_scaling_decision = 16;
-    // When true, this empty response was caused by the server rejecting the poll
+    // When true, this empty response was caused by the server completing the poll
     // because the worker has been shut down via the ShutdownWorker API. The SDK
     // should stop polling on this task queue.
-    bool shutdown_worker_rejected = 17;
+    //
+    // (-- api-linter: core::0140::prepositions=disabled
+    //     aip.dev/not-precedent: "by" describes the cause of poll completion. --)
+    bool completed_by_worker_shutdown = 17;
 }
 
 message RespondWorkflowTaskCompletedRequest {
@@ -540,10 +543,13 @@ message PollActivityTaskQueueResponse {
     temporal.api.common.v1.Priority priority = 19;
     // The run ID of the activity execution, only set for standalone activities.
     string activity_run_id = 20;
-    // When true, this empty response was caused by the server rejecting the poll
+    // When true, this empty response was caused by the server completing the poll
     // because the worker has been shut down via the ShutdownWorker API. The SDK
     // should stop polling on this task queue.
-    bool shutdown_worker_rejected = 21;
+    //
+    // (-- api-linter: core::0140::prepositions=disabled
+    //     aip.dev/not-precedent: "by" describes the cause of poll completion. --)
+    bool completed_by_worker_shutdown = 21;
 }
 
 message RecordActivityTaskHeartbeatRequest {
@@ -1931,10 +1937,13 @@ message PollNexusTaskQueueResponse {
     temporal.api.nexus.v1.Request request = 2;
     // Server-advised information the SDK may use to adjust its poller count.
     temporal.api.taskqueue.v1.PollerScalingDecision poller_scaling_decision = 3;
-    // When true, this empty response was caused by the server rejecting the poll
+    // When true, this empty response was caused by the server completing the poll
     // because the worker has been shut down via the ShutdownWorker API. The SDK
     // should stop polling on this task queue.
-    bool shutdown_worker_rejected = 4;
+    //
+    // (-- api-linter: core::0140::prepositions=disabled
+    //     aip.dev/not-precedent: "by" describes the cause of poll completion. --)
+    bool completed_by_worker_shutdown = 4;
 }
 
 message RespondNexusTaskCompletedRequest {