Remove ControlPlots; migrate plotting to Makie + MakieControlPlots

.github/workflows/CI.yml

@@ -56,12 +56,6 @@ jobs:
             ${{ runner.os }}-test-
             ${{ runner.os }}-
       - uses: julia-actions/julia-buildpkg@v1
-      - name: Install matplotlib
-        if: runner.os == 'Linux'
-        run: sudo apt-get update && sudo apt-get install -y python3-matplotlib
-      - name: Build PyCall with system Python
-        if: runner.os == 'Linux'
-        run: julia -e 'ENV["PYTHON"]="python3"; using Pkg; Pkg.add("PyCall"); Pkg.build("PyCall")'
       - uses: julia-actions/julia-runtest@v1
         env:
           BUILD_IS_PRODUCTION_BUILD: ${{ matrix.build_is_production_build }}
@@ -89,10 +83,6 @@ jobs:
         version: ${{ matrix.julia_version }}
     - uses: julia-actions/cache@v2
     - uses: julia-actions/julia-buildpkg@v1
-    - name: Install matplotlib
-      run: sudo apt-get update && sudo apt-get install -y python3-matplotlib
-    - name: Build PyCall with system Python
-      run: julia -e 'ENV["PYTHON"]="python3"; using Pkg; Pkg.add("PyCall"); Pkg.build("PyCall")'
     - uses: julia-actions/julia-runtest@v1
       env:
         BUILD_IS_PRODUCTION_BUILD: false

CHANGELOG.md

@@ -1,5 +1,22 @@
 # Changelog
 
+## Unreleased
+
+### Removed
+- The `ControlPlots` plotting backend and its extension
+  `VortexStepMethodControlPlotsExt`, together with the `PythonCall`/Matplotlib
+  setup it required. Plotting is now Makie-only.
+- The plot-backend dispatch machinery: `PlotBackend`, `MakieBackend`,
+  `ControlPlotsBackend`, and `set_plot_backend!`. Plotting functions work as
+  soon as a Makie backend and `MakieControlPlots` are loaded.
+- `plot_circulation_distribution` (an exported stub that was never implemented).
+- The `examples_cp/` directory and the `menu_cp()` ControlPlots example menu.
+
+### Changed
+- The Makie extension now also loads when `MakieControlPlots` is present and uses
+  it for `plot_section_polars`. Examples load `GLMakie`/`CairoMakie` together
+  with `MakieControlPlots`.
+
 ## VortexStepMethod v3.3.6 2026-06-13
 
 ### Added