docs: add v3.3.0 changelog entry

Issue #1074

Author: saurabhjain1592

CHANGELOG.md

@@ -5,6 +5,18 @@ All notable changes to the AxonFlow Java SDK will be documented in this file.
 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).
 
+## [3.3.0]
+
+### Added
+
+- **`cancelExecution(executionId, reason)`**: Cancel a unified execution (MAP plan or WCP workflow) via `POST /api/v1/unified/executions/{id}/cancel`. Overloaded variant without reason parameter.
+
+### Fixed
+
+- **Unified execution API URLs**: `getExecutionStatus()` and `listUnifiedExecutions()` now use correct `/api/v1/unified/executions` path (was `/api/v1/executions`)
+
+---
+
 ## [3.2.0] - 2026-02-05
 
 ### Added