Update changelog

Author: max-models

CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Global Backend Control**:
     - `xp.set_backend(name)`: Globally switch the active backend at runtime.
     - `xp.use_backend(name)`: Context manager for temporary, scoped backend switching.
+    - `xp.numpy_backend` & `xp.cupy_backend`: Boolean properties to check the globally active backend.
 - **Synchronization**:
     - `xp.synchronize()`: Blocks until GPU operations are complete (no-op on CPU). Essential for accurate benchmarking.
 - **Developer Experience**:
@@ -25,7 +26,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 - **Dynamic Dispatch Architecture**: Refactored `src/cunumpy/xp.py` to use module-level `__getattr__`. This ensures that `cunumpy.<op>` calls always resolve to the currently active backend module, enabling seamless runtime switching via `set_backend`.
 - **Type Safety**: Updated `src/cunumpy/__init__.pyi` stubs to provide full IDE autocompletion and type-checking for all new API methods.
-- **Documentation**: Enhanced `README.md` with usage examples for the new backend control and synchronization features.
+- **Documentation**: 
+    - Simplified `README.md` and documentation to exclusively focus on PyPI installation (`pip install cunumpy`).
+    - Enhanced `quickstart.md` and `api.md` with usage examples for the new backend control and synchronization features.
+- **CI/CD**: Restricted GitHub Pages documentation deployment to the `devel` branch only.
 
 ### Fixed
 - Improved `ArrayBackend` initialization to fallback gracefully to NumPy if CuPy is requested but not installed.