Add CHANGELOG and auto-generate GitHub release notes

Introduce CHANGELOG.md documenting the 2.6.3 release (folding in the tag-less
interim 2.6.2 changes, i.e. everything since the last tagged release 2.6.1) and
recording the new release process. This addresses the long-standing request for
a changelog (#235).

Also set generateReleaseNotes: true on the release-action step so each GitHub
Release body is auto-populated with the merged PRs since the previous tag,
instead of being empty. The curated highlights live in CHANGELOG.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Horde

.github/workflows/wheels.yml

@@ -171,6 +171,9 @@ jobs:
           name: ${{ needs.check_version.outputs.version }}
           prerelease: ${{ needs.check_version.outputs.prerelease }}
           allowUpdates: true
+          # Auto-populate the release body with the merged PRs since the
+          # previous tag (curated highlights live in CHANGELOG.md).
+          generateReleaseNotes: true
           artifacts: "./artifacts/**/*"
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: Publish to PyPI

CHANGELOG.md

@@ -0,0 +1,70 @@
+# Changelog
+
+All notable, user-facing changes to the `libigl` Python bindings are recorded
+here. The project loosely follows [Semantic Versioning](https://semver.org) and
+version numbers match the [PyPI releases](https://pypi.org/project/libigl/#history).
+
+> Historical note: releases up to and including 2.6.2 were published to PyPI
+> without matching git tags or GitHub releases (see #235). Starting with 2.6.3,
+> pushing a version bump to `main` automatically creates the git tag, the GitHub
+> release, and the PyPI upload together (#313). The 2.6.3 section below therefore
+> folds in changes first shipped in the tag-less interim 2.6.2 release, i.e. it
+> covers everything since the last tagged release, 2.6.1.
+
+## 2.6.3 — 2026-08-31
+
+### Added
+
+New function bindings:
+
+- **Distances & closest points:** `simplex_simplex_squared_distance`,
+  `point_simplex_squared_distance`, `offset_surface`.
+- **Rotations / ARAP:** `polar_svd3x3`, `fit_rotations`.
+- **Quad meshes:** `quad_planarity`, `planarize_quad_mesh`, `quad_edges`.
+- **Curves & mesh topology:** `ramer_douglas_peucker`, `path_to_edges`,
+  `connect_boundary_to_infinity`, `smooth_corner_adjacency`,
+  `per_face_normals_stable`, `resolve_duplicated_faces`, `vertex_components`,
+  `is_vertex_manifold`, `is_intrinsic_delaunay`.
+- **Remeshing:** `triangle.remesh_at_points`.
+- **Winding numbers & distance fields:** `swept_volume`,
+  `swept_volume_bounding_box`, `swept_volume_signed_distance`,
+  point-cloud and pre-built-tree support for `fast_winding_number`,
+  `lipschitz_octree`, `unique_sparse_voxel_corners`, and an edge→vertex (`E2V`)
+  output for sparse `marching_cubes`.
+- **Ambient occlusion:** core `ambient_occlusion` binding.
+- **Solvers & energies:** `active_set`, `boundary_conditions`,
+  `harmonic_integrated_from_laplacian_and_mass`, Hessian and Hessian-energy
+  operators, and cross-field bindings.
+- **Bounding boxes:** oriented-bounding-box functions, `bounding_box_diagonal`.
+- **Curves & predicates:** cubic Bézier evaluation and roots, additional
+  `igl::predicates` bindings, `igl::spectra` bindings, and
+  `lexicographic_triangulation`.
+- **Misc:** `centroid`, a `face_areas` overload taking intrinsic edge lengths,
+  and an optional `seed` parameter for `random_points_on_mesh`.
+
+### Changed
+
+- Bumped the bundled libigl to
+  [`f68f01c2`](https://github.com/libigl/libigl/commit/f68f01c23ac82351e2543ce8c529b6d4c89fdf16).
+- `cycodebase` distance queries can now reuse a prebuilt AABB tree / precomputed
+  bases for fast repeated queries.
+- Releases are now cut by pushing a version bump to `main`, which tags the
+  commit and creates the GitHub release and PyPI upload in one step (#313).
+
+### Packaging / CI
+
+- Added CPython 3.13 wheels.
+- Switched the Linux CI builds to Clang to fix a 2.6.1 performance regression.
+- Bumped `pypa/gh-action-pypi-publish` to 1.13.0.
+
+## 2.6.2 — PyPI only
+
+Interim release published to PyPI on 2025 without a git tag or GitHub release.
+Its changes are folded into the 2.6.3 entry above.
+
+## 2.6.1 — 2025-05-15
+
+Last release before this changelog was introduced. See the
+[git history](https://github.com/libigl/libigl-python-bindings/commits/2.6.1)
+and the [PyPI release history](https://pypi.org/project/libigl/#history) for
+earlier changes.