🔖 Prepare release of v3.2.0 (#669)

## Description

This PR prepares the release of v3.2.0.

## Checklist:

- [x] The pull request only contains commits that are focused and
relevant to this change.
- [x] ~~I have added appropriate tests that cover the new/changed
functionality.~~
- [x] ~~I have updated the documentation to reflect these changes.~~
- [x] I have added entries to the changelog for any noteworthy
additions, changes, fixes, or removals.
- [x] I have added migration instructions to the upgrade guide (if
needed).
- [x] The changes follow the project's style guidelines and introduce no
new warnings.
- [x] The changes are fully tested and pass the CI checks.
- [x] I have reviewed my own code changes.

Author: denialhaag

CHANGELOG.md

@@ -9,6 +9,10 @@ This project adheres to [Semantic Versioning], with the exception that minor rel
 
 ## [Unreleased]
 
+## [3.2.0] - 2025-08-01
+
+_If you are upgrading: please see [`UPGRADING.md`](UPGRADING.md#320)._
+
 ### Added
 
 - 🐍 Build Python 3.14 wheels ([#665]) ([**@denialhaag**])
@@ -72,9 +76,10 @@ _📚 Refer to the [GitHub Release Notes] for previous changelogs._
 
 <!-- Version links -->
 
-[unreleased]: https://github.com/munich-quantum-toolkit/qcec/compare/v3.1.0...HEAD
-[3.1.0]: https://github.com/munich-quantum-toolkit/qcec/compare/v3.0.0...v3.1.0
-[3.0.0]: https://github.com/munich-quantum-toolkit/qcec/compare/v2.8.2...v3.0.0
+[unreleased]: https://github.com/munich-quantum-toolkit/qcec/compare/v3.2.0...HEAD
+[3.2.0]: https://github.com/munich-quantum-toolkit/qcec/releases/tag/v3.2.0
+[3.1.0]: https://github.com/munich-quantum-toolkit/qcec/releases/tag/v3.1.0
+[3.0.0]: https://github.com/munich-quantum-toolkit/qcec/releases/tag/v3.0.0
 [2.8.2]: https://github.com/munich-quantum-toolkit/qcec/releases/tag/v2.8.2
 
 <!-- PR links -->

UPGRADING.md

@@ -4,6 +4,8 @@ This document describes breaking changes and how to upgrade. For a complete list
 
 ## [Unreleased]
 
+## [3.2.0]
+
 Testing previous versions of the `mqt-qcec` package built via `uv sync` or simple `(uv) pip install .` generally failed due to binary incompatibility of the `mqt-core` compiled extension packages and the `mqt-qcec` one.
 This required building `mqt-core` from source and without build isolation to get a working local setup.
 By using the latest `pybind11` release (`v3`), the binary compatibility between extension modules compiled under different circumstances (such as different compilers) has been greatly increased.
@@ -54,7 +56,8 @@ Alternatively, CMake can be conveniently installed from PyPI using the [`cmake`]
 
 <!-- Version links -->
 
-[unreleased]: https://github.com/munich-quantum-toolkit/qcec/compare/v3.1.0...HEAD
+[unreleased]: https://github.com/munich-quantum-toolkit/qcec/compare/v3.2.0...HEAD
+[3.2.0]: https://github.com/munich-quantum-toolkit/qcec/compare/v3.1.0...v3.2.0
 [3.1.0]: https://github.com/munich-quantum-toolkit/qcec/compare/v3.0.0...v3.1.0
 [3.0.0]: https://github.com/munich-quantum-toolkit/qcec/compare/v2.8.2...v3.0.0