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## What changed?
Added support for Nexus workflow update completion callbacks via CHASM.
This allows a Nexus caller to be notified when a workflow update
completes by attaching completion callbacks to the update request.
## Why?
Nexus operations that target workflow updates need a way to receive
completion notifications. Without this, a Nexus caller that sends an
update has no async mechanism to learn when the update finishes.
Completion callbacks enable the same async notification pattern that
already exists for workflow-level Nexus operations.
## How did you test it?
- [ ] built
- [x] run locally and tested manually
- [ ] covered by existing tests
- [x] added new unit test(s)
- [x] added new functional test(s)
## Potential risks
Touches speculative workflow updates, they are always hard to reason
about. Tried to compensate with lots of test coverage.
Note: Needs this API PR
https://github.com/temporalio/api/pull/742/changes
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **High Risk**
> Touches workflow update state machine and mutable state event handling
to persist/trigger per-update callbacks, including close/retry/reset
paths, which is complex and can affect correctness of update outcomes
and callback delivery.
>
> **Overview**
> Adds **workflow update completion callbacks** via CHASM so Nexus
callers can register callbacks on `UpdateWorkflowExecution` and have
them fired on update completion or workflow close.
>
> This introduces a `WorkflowUpdate` CHASM component with new
`UpdateState` protobuf (including persisted `rejection_failure`), stores
update callbacks under `Workflow.Updates`, and extends callback
processing to handle *update-level* callbacks on update completion,
rejection (including reset/reapply), and on run transitions
(retry/timeout/continue-as-new) where update callbacks must fire even if
workflow-level callbacks are inherited.
>
> It also adds dynamic config gates/limits
(`EnableWorkflowUpdateCallbacks`, `MaxCallbacksPerUpdateID`), updates
`DescribeWorkflow` to surface update callback triggers, extends mutable
state/history builder APIs to carry per-update callback options in
`WorkflowExecutionOptionsUpdated`, and adds `Update.AttachCallbacks`
logic to persist/flush callbacks (including buffering while `stateSent`,
request-id dedup, and stricter validation requiring `request_id` when
callbacks are present).
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
4484fee104. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
---------
Co-authored-by: long-nt-tran <long.tran@temporal.io>