ci(ios): execute the custom-action runner regressions instead of only compiling them

The iOS workflow runs a targeted -only-testing list, so a runner test that is
not named there is compiled by the build step and then never executed. All seven
custom-action tests were in that gap — including the containment regression,
which is the only executable proof that a hung AX read cannot accumulate
orphaned in-flight reads.

Red/green against the containment regression, with the fix reverted to its
pre-fix concurrency behavior (global concurrent queue, no single-flight guard,
no blocked exit):

  RED   in-flight 6 (want 1), dispatches 6 (want 1), each repeat paid the full
        1.004s deadline (want <0.2s), blocked=false (want true), and the
        in-flight drain never completed — "Exceeded timeout of 5 seconds".
  GREEN 7/7 pass, containment regression in 1.02s.

Author: thymikee

.github/workflows/ios.yml

@@ -115,7 +115,14 @@ jobs:
             -only-testing:AgentDeviceRunnerUITests/RunnerTests/testRunnerScreenshotStabilitySettledFalseOnMidWindowMismatch \
             -only-testing:AgentDeviceRunnerUITests/RunnerTests/testRunnerScreenshotStabilitySettledFalseOnFailedCapture \
             -only-testing:AgentDeviceRunnerUITests/RunnerTests/testRunnerScreenshotStabilitySettledOnlyLooksAtTheTrailingWindow \
-            -only-testing:AgentDeviceRunnerUITests/RunnerTests/testRunnerScreenshotStabilitySettledRejectsDegenerateRequirement
+            -only-testing:AgentDeviceRunnerUITests/RunnerTests/testRunnerScreenshotStabilitySettledRejectsDegenerateRequirement \
+            -only-testing:AgentDeviceRunnerUITests/RunnerTests/testCustomActionsRequestPinsPrivateAXBackend \
+            -only-testing:AgentDeviceRunnerUITests/RunnerTests/testPrivateAXNodesCarryAnnotatedCustomActions \
+            -only-testing:AgentDeviceRunnerUITests/RunnerTests/testRequestPinnedBackendReportsItsOwnReason \
+            -only-testing:AgentDeviceRunnerUITests/RunnerTests/testCustomActionCoverageParsesOnlyCompletePairs \
+            -only-testing:AgentDeviceRunnerUITests/RunnerTests/testPartialCustomActionPassIsDisclosedAndCompleteOneIsNot \
+            -only-testing:AgentDeviceRunnerUITests/RunnerTests/testActionNamesAreCappedPerElementAndReported \
+            -only-testing:AgentDeviceRunnerUITests/RunnerTests/testHungCustomActionReadIsContainedAndRecovers
 
       - name: Preflight iOS runner through public CLI
         run: |