ruby: Rejoin queue when retry has no history

ruby/README.md

@@ -46,7 +46,7 @@ minitest-queue --queue redis://example.com \
   run -Itest test/**/*_test.rb
 ```
 
-Worker-history retries require the retry to retain its worker ID and queue build ID. Missing reservation history or suite chunk metadata fails the retry. The replay uses a local retry queue and does not rejoin the shared queue, so surviving workers must drain any remaining work. When centralized reporting is used, restarting every worker before the shared queue is exhausted fails the build rather than accepting an incomplete run.
+Worker-history retries require the retry to retain its worker ID and queue build ID. A worker retried before reserving tests rejoins the shared queue, while missing suite chunk metadata fails the retry. Replaying existing history uses a local retry queue and does not rejoin the shared queue, so surviving workers must drain any remaining work. When centralized reporting is used, restarting every worker before the shared queue is exhausted fails the build rather than accepting an incomplete run.
 
 
 If you'd like to centralize the error reporting you can do so with:

ruby/lib/ci/queue/redis/worker.rb

@@ -541,8 +541,6 @@ def failed_test_ids(reservations)
         end
 
         def worker_history_test_ids(reservations)
-          raise WorkerHistoryError, "Reservation history is missing for worker #{worker_id}" if reservations.empty?
-
           reservations.reverse.flat_map { |id| expand_reservation(id) }.uniq
         end
 

ruby/test/ci/queue/redis_test.rb

@@ -71,12 +71,10 @@ def test_retry_queue_with_worker_history
     assert_equal original_order, poll(retry_queue)
   end
 
-  def test_worker_history_retry_requires_reservations
-    error = assert_raises(CI::Queue::Redis::WorkerHistoryError) do
-      @queue.retry_queue(selection: :worker_history)
-    end
+  def test_worker_history_retry_without_reservations_is_empty
+    retry_queue = @queue.retry_queue(selection: :worker_history)
 
-    assert_equal 'Reservation history is missing for worker 1', error.message
+    assert_predicate retry_queue, :exhausted?
   end
 
   def test_worker_history_retry_requires_complete_replay

ruby/test/integration/minitest_redis_test.rb

@@ -232,13 +232,14 @@ def test_worker_history_retry_replays_all_reserved_tests
       assert_equal 'Ran 100 tests, 100 assertions, 0 failures, 0 errors, 0 skips, 0 requeues in X.XXs', output
     end
 
-    def test_worker_history_retry_fails_without_worker_reservations
+    def test_worker_history_retry_rejoins_queue_without_worker_reservations
       run_worker_history_worker(retry_count: 0, build_id: 'missing-history', worker_id: '1')
 
       out, = run_worker_history_worker(retry_count: 1, build_id: 'missing-history', worker_id: '2')
 
-      refute_predicate $?, :success?
-      assert_includes out, 'Reservation history is missing for worker 2'
+      assert_predicate $?, :success?
+      assert_includes out, "The retry queue does not contain any failure, we'll process the main queue instead."
+      assert_includes out, 'All tests were ran already'
     end
 
     def test_worker_history_retry_fails_when_replay_stops_early