chore: prepare CTModels v0.20.0 release

BREAKING.md

@@ -2,7 +2,7 @@
 
 This document describes breaking changes in CTModels releases and how to migrate your code.
 
-## [Unreleased]
+## [0.20.0] - 2026-10-19
 
 ### `Makie.plot(; kwargs...)` is removed
 

CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-### ⚠️ Breaking
+## [0.20.0] - 2026-10-19
+
+### 💥 Breaking Changes
 
 - **`Makie.plot(; kwargs...)` is removed**
   ([#466](https://github.com/control-toolbox/CTModels.jl/issues/466)). The zero-argument
@@ -54,7 +56,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - `Solution` gains an eleventh field and type parameter, `switching`; the ten-argument
     positional constructor is kept and builds an `EmptySwitchingModel`.
 
-### 🔧 Fixed
+### 🐛 Bug Fixes
 
 - **Export/import round trip of a `Solution` with unset optional solver fields**
   ([#464](https://github.com/control-toolbox/CTModels.jl/issues/464)). A solution whose
@@ -78,6 +80,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   `Breakage.yml` moves to `breakage-suite.yml` (one report, the `REL1` check of a release
   PR) and also runs on push to `main`; `Documentation.yml` accepts `workflow_dispatch`.
 
+### ✅ Compatibility
+
+- **Breaking changes**: see the migration blocks in [BREAKING.md](BREAKING.md).
+
 ## [0.19.8] - 2026-10-14
 
 ### 🔧 Fixed

Project.toml

@@ -1,6 +1,6 @@
 name = "CTModels"
 uuid = "34c4fa32-2049-4079-8329-de33c2a22e2d"
-version = "0.19.8"
+version = "0.20.0"
 authors = ["Olivier Cots <olivier.cots@toulouse-inp.fr>"]
 
 [deps]