[Bug] Issues with ReserveCtxFromBridge

[cretz]

Describe the bug

There was a bug in older CLI where persistence may fail and the worker was getting something like this warning:

2025-04-17T18:56:22.257529Z  WARN temporal_sdk_core::worker::workflow: Task not found when completing error=status: NotFound, message: "Namespace 0196451a-5a35-7546-9b8d-84a40f52f73e is not found."

Notice the namespace not found. This may be causing a panic/segfault somewhere in the code. Try to replicate this situation, maybe by deleting the namespace while running.

[cretz]

Here's a segfault on Windows after this came from the server:

Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
   at Temporalio.Bridge.CustomSlotSupplier.ReserveCtxFromBridge(Temporalio.Bridge.Interop.SlotReserveCtx*)
   at Temporalio.Bridge.CustomSlotSupplier+<>c__DisplayClass8_0+<<SafeReserve>b__0>d.MoveNext()
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1+AsyncStateMachineBox`1[[System.Threading.Tasks.VoidTaskResult, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext(System.Threading.Thread)
   at System.Runtime.CompilerServices.TaskAwaiter+<>c.<OutputWaitEtwEvents>b__12_0(System.Action, System.Threading.Tasks.Task)
   at System.Threading.Tasks.AwaitTaskContinuation.RunOrScheduleAction(System.Action, Boolean)
   at System.Threading.Tasks.Task.RunContinuations(System.Object)
   at System.Threading.Tasks.Task.TrySetResult()
   at System.Threading.Tasks.Task+DelayPromise.CompleteTimedOut()
   at System.Threading.TimerQueueTimer.Fire(Boolean)
   at System.Threading.TimerQueue.FireNextTimers()
   at System.Threading.UnmanagedThreadPoolWorkItem.ExecuteUnmanagedThreadPoolWorkItem(IntPtr, IntPtr)
   at System.Threading.UnmanagedThreadPoolWorkItem.ExecuteUnmanagedThreadPoolWorkItem(IntPtr, IntPtr)
   at System.Threading.UnmanagedThreadPoolWorkItem.System.Threading.IThreadPoolWorkItem.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()

[cretz]

There are also issues after the server leaves like:

[10:49:12] fail: Temporalio.Bridge.CustomSlotSupplier[0]
      Error reserving slot
      System.ArgumentNullException: Array cannot be null. (Parameter 'bytes')
         at System.Text.Encoding.GetString(Byte* bytes, Int32 byteCount)
         at Temporalio.Bridge.ByteArrayRef.ToUtf8(TemporalCoreByteArrayRef byteArray) in c:\work\tem\sdk-dotnet\c-bridge-client\temporal-sdk-dotnet\src\Temporalio\Bridge\ByteArrayRef.cs:line 94
         at Temporalio.Bridge.CustomSlotSupplier.ReserveCtxFromBridge(TemporalCoreSlotReserveCtx* ctx) in c:\work\tem\sdk-dotnet\c-bridge-client\temporal-sdk-dotnet\src\Temporalio\Bridge\CustomSlotSupplier.cs:line 213
         at Temporalio.Bridge.CustomSlotSupplier.<>c__DisplayClass8_0.<<SafeReserve>b__0>d.MoveNext() in c:\work\tem\sdk-dotnet\c-bridge-client\temporal-sdk-dotnet\src\Temporalio\Bridge\CustomSlotSupplier.cs:line 97

and

[10:49:12] fail: Temporalio.Bridge.CustomSlotSupplier[0]
      Error reserving slot
      System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. (Parameter 'ctx')
         at Temporalio.Bridge.CustomSlotSupplier.ReserveCtxFromBridge(TemporalCoreSlotReserveCtx* ctx) in c:\work\tem\sdk-dotnet\c-bridge-client\temporal-sdk-dotnet\src\Temporalio\Bridge\CustomSlotSupplier.cs:line 219
         at Temporalio.Bridge.CustomSlotSupplier.<>c__DisplayClass8_0.<<SafeReserve>b__0>d.MoveNext() in c:\work\tem\sdk-dotnet\c-bridge-client\temporal-sdk-dotnet\src\Temporalio\Bridge\CustomSlotSupplier.cs:line 97