changelog: add 0.6.3 entry for Scope::awaitCompletion fix

Author: EdmondDantes

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to the Async extension for PHP will be documented in this fi
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.6.3] - 2026-03-24
+
+### Fixed
+- **`Scope::awaitCompletion()` ignoring completion**: `async_scope_notify_coroutine_finished()` was missing the call to `scope_check_completion_and_notify()`, so `awaitCompletion()` never woke up when all coroutines finished and always waited until the timeout expired.
+- **`Scope::awaitAfterCancellation()` cleanup**: Replaced `zend_async_waker_clean()` with `ZEND_ASYNC_WAKER_DESTROY()` on error paths, and switched to checking the return value of `zend_async_resume_when()` instead of `EG(exception)`.
+
 ## [0.6.2] - 2026-03-24
 
 ### Added