Bump version to 5.2.0

- [Add IAsyncEnumerable support to task computation expressions](#347) Credits @Copilot
- [Add `valueTaskValueOption` CE for `ValueTask<'T voption>` computation expressions](#348) Credits @Copilot
- [Add `cancellableValueTaskOption` and `cancellableValueTaskResult` CEs for IcedTasks](#349) Credits @Copilot
- [Add `Source` overloads to `taskResultOption` CE for interop with `Result`, `TaskResult`, `Option`, `Task`, and `Async`](#351) Credits @Copilot
- [Add `requireSomeWith` and `requireNoneWith` for lazy error evaluation](#352) Credits @Copilot
- [Add `TaskResult.ofCatchTask`](#353) Credits @Copilot
- [Add comprehensive gitbook documentation for all public API surface](#354) Credits @Copilot

Remove AutoGPT subproject reference

Author: TheAngryByrd

%TEMP%/AutoGPT

@@ -1,4 +1,4 @@
-### 5.2.0-beta001 - February 27, 2026
+### 5.2.0 - February 27, 2026
 
 - [Add IAsyncEnumerable support to task computation expressions](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/347) Credits @Copilot
 - [Add `valueTaskValueOption` CE for `ValueTask<'T voption>` computation expressions](https://github.com/demystifyfp/FsToolkit.ErrorHandling/pull/348) Credits @Copilot