Update Dependencies

[zfergus]

Description

• Bump Abseil from 20250512.1 to 20260107.0
• Bump Catch2 from v3.8.1 to v3.12.0
• Bump Eigen from 3.4.0 to 5.0.1
• Bump JSON from v3.11.2 to v3.12.0
• Bump libigl from 89267b4a80b1904de3f6f2812a2053e5e9332b7e to v2.6.0
• Bump TBB from v2022.1.0 to v2022.3.0
• Bump Pybind11 from v2.13.1 to v3.0.1
• Bump robin-map from v1.4.0 to v1.4.1
• Bump spdlog from v1.15.3 to v1.17.0
• Update dependencies.rst with xsimd

[Copilot]

Pull request overview

This PR updates several third-party dependencies (Abseil, Catch2, Eigen, nlohmann/json, libigl, TBB, pybind11, robin-map, spdlog) and brings the documentation and dependency graphs in line with the current build configuration, including explicit documentation of xsimd and test/python dependencies. It also centralizes Eigen’s vectorization control into the Eigen recipe and ties it to the SIMD option, simplifying configuration.

Changes:

• Bump versions of core C++ and Python-related third-party libraries (Abseil, Catch2, Eigen, nlohmann/json, libigl, oneTBB, pybind11, robin-map, spdlog).
• Document xsimd as an optional SIMD dependency and update the dependency graph/legend to include it; add explicit sections for Python bindings and unit test dependencies.
• Move Eigen’s EIGEN_DONT_VECTORIZE handling into eigen.cmake and couple it with IPC_TOOLKIT_WITH_SIMD, removing the duplicated compile definition from the top-level CMakeLists.txt.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/source/about/dependencies.rst	Updates optional dependency table to include xsimd and moves pybind11-related entries into new Python bindings and unit-test dependency tables.
docs/source/_static/graphviz/dependencies.svg	Regenerated dependency graph SVG to reflect the current dependency set and the new xsimd node.
docs/source/_static/graphviz/dependencies.dot	Updates DOT source for the dependencies graph, adding an xsimd node and tuning layout spacing.
cmake/recipes/spdlog.cmake	Bumps spdlog CPM package from 1.15.3 to 1.17.0.
cmake/recipes/robin_map.cmake	Bumps robin-map CPM package from 1.4.0 to 1.4.1.
cmake/recipes/pybind11.cmake	Bumps pybind11 CPM package from 2.13.1 to 3.0.1.
cmake/recipes/onetbb.cmake	Bumps oneTBB CPM package from 2022.1.0 to 2022.3.0.
cmake/recipes/libigl.cmake	Switches libigl from a pinned commit hash to tagged release 2.6.0.
cmake/recipes/json.cmake	Bumps nlohmann/json to v3.12.0 and updates the release archive hash.
cmake/recipes/eigen.cmake	Bumps Eigen to 5.0.1, removes the MPL2-only option, and centralizes EIGEN_DONT_VECTORIZE handling (including when SIMD is enabled).
cmake/recipes/catch2.cmake	Bumps Catch2 from 3.8.1 to 3.12.0.
cmake/recipes/abseil.cmake	Updates Abseil from LTS 20250512.1 to the commit corresponding to LTS 20260107.0.
CMakeLists.txt	Removes the top-level EIGEN_DONT_VECTORIZE definition under IPC_TOOLKIT_WITH_SIMD now that it’s handled in eigen.cmake; leaves SIMD/xsimd wiring intact.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.97%. Comparing base (a9ece21) to head (42c6ee9).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
- Coverage   97.34%   96.97%   -0.38%     
==========================================
  Files         161      161              
  Lines       24664    24748      +84     
  Branches      877      894      +17     
==========================================
- Hits        24010    24000      -10     
- Misses        654      748      +94     

Flag	Coverage Δ
unittests	96.97% <ø> (-0.38%)	⬇️

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