Trim v0.6.0 announcement in README to one line

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: waltsims

docs/README.md

@@ -8,24 +8,7 @@
 This project is a Python implementation of v1.4.0 of the [MATLAB toolbox k-Wave](http://www.k-wave.org/) as well as an
 interface to the pre-compiled v1.3 of k-Wave simulation binaries, which support NVIDIA sm 5.0 (Maxwell) to sm 9.0a (Hopper) GPUs.
 
-## What's New in v0.6.0
-
-**Unified API:** A single `kspaceFirstOrder()` function replaces `kspaceFirstOrder2D` / `3D` and their options classes.
-Dimensionality is auto-detected from the grid. All simulation parameters are keyword arguments.
-
-**Python solver:** A pure NumPy/CuPy solver runs 1D, 2D, and 3D simulations without the C++ binary.
-Use `device="gpu"` for GPU acceleration via CuPy.
-
-```python
-from kwave.kspaceFirstOrder import kspaceFirstOrder
-
-result = kspaceFirstOrder(kgrid, medium, source, sensor)           # NumPy CPU
-result = kspaceFirstOrder(kgrid, medium, source, sensor, device="gpu")  # CuPy GPU
-result = kspaceFirstOrder(kgrid, medium, source, sensor, backend="cpp") # C++ binary
-```
-
-The legacy `kspaceFirstOrder2D` / `3D` functions still work but emit deprecation warnings.
-See the [Unified API guide](https://k-wave-python.readthedocs.io/en/latest/get_started/new_api.html) for migration details.
+**New in v0.6.0:** Unified `kspaceFirstOrder()` API with a pure NumPy/CuPy solver. See the [API guide](https://k-wave-python.readthedocs.io/en/latest/get_started/new_api.html).
 
 ## Mission