Full rebuild October 2026 bump ros2-distro-mutex to 0.21.0 and build number to 27 and switch to new pinning mechanism

[mini-1235]

Full rebuild for October 2026: new build number and mutex, the new vinca pinning mechanism (as in RoboStack/ros-rolling#41), and the fixes needed for the new compilers and pinned dependencies.

Rebuild bookkeeping

• build_number 25 → 27 (the reminder in vinca.yaml now says 28 for the next one); ros2-distro-mutex 0.20.0 → 0.21.0, with the vtk run constraint moved to 9.7.0.* to match the new pin.
• Removed the stale build_number: 26 overrides from pkg_additional_info.yaml (diagnostic_updater, robot_state_publisher, tf2_ros).
• Refreshed rosdistro_snapshot.yaml.
• Pinned vinca to the current upstream main (5767846).
• ⚠️ Temporary, remove before merging: testpr.yml evicts the cached ament_cmake_python packages, which this PR's first Windows run built before the fix above.
• The CI build cache is keyed per PR, so this PR starts from an empty cache; no cache entries need to be deleted.

New pinning mechanism

conda_build_config.yaml is now generated by vinca-pinning-render from the new vinca_pinning.yaml and should not be edited by hand (AGENTS.md is updated accordingly):

• conda-forge pinning 2026.09.25.23.22.04, plus the migrations selected by vinca-pinning-update: elfutils0196, giflib6, go_macos, gstreamer128, hdf52, libboost190, proj99, urdfdom6, vtk970.
• Lyrical overrides: compiler/stdlib settings (glibc 2.28, macOS 14.0 deployment target), libzenohc/libzenohcxx 1.10.1, lua 5.4, sip 6.15, Python 3.14.
• Notable pin changes that drive the fixes below: gcc 15 / clang 21, OpenCV 5.0, CMake 4, libxml2 2.15.

Fixes

• rosidl_generator_py (from Stop linking the Python bindings library into C++ consumers of interface packages (fixes dyld _PyExc_RuntimeError / ros-kilted#76) ros-rolling#51): C++ consumers of interface packages no longer link the Python bindings library (_PyExc_RuntimeError on macOS, Static linking issue with _rosidl_generator_py.so in build _17 ros-kilted#76). This replaces the old macOS-only patch, and adds a std_msgs regression test (tests/ros-lyrical-std-msgs*). All interface packages are rebuilt by this full rebuild, as that fix requires.
• OpenCV 5 (calib3d split into calib + geometry, removed C API):
  • ported the rolling patches for cv_bridge, image_geometry, image_proc, image_rotate, stereo_image_proc, depth_image_proc, compressed_image_transport, theora_image_transport, rqt_image_view, apriltag_mit, apriltag_ros (Linux only), and the OpenCV part of moveit_ros_perception;
  • rtabmap 0.23.7: backported only the OpenCV 5 parts of upstream OpenCV 5 support introlab/rtabmap#1732 (not yet in a release), merged with the existing lyrical patch.
• CMake 4: raised cmake_minimum_required for lanelet2 and mrt_cmake_modules (from rolling).
• py_trees_js 0.7.0 moved its build backend to hatchling (patch/dependencies.yaml).
• nav2_map_server 1.5.2: refreshed the patch (upstream now already skips the Linux uuid library on macOS; the Windows UUID/NOMINMAX parts are kept).
• Windows / ament_cmake_python (from ros-rolling): the Python interpreter path is embedded in install(CODE ...) strings, and on Windows its backslashes became invalid CMake escapes (Invalid character escape '\b'), failing the install step of e.g. ament_cmake_test. The path is now converted to forward slashes first.
• Added a build-up-to pixi task (from Add build-up-to Pixi task ros-rolling#47), e.g. pixi run build-up-to ros-lyrical-desktop --continue-on-failure.

Testing

• pixi run check-patches: 89/89 patched recipes apply cleanly (after rebasing on the current main).
• Local osx-arm64 builds of the packages touched above, and a build-up-to ros-lyrical-desktop run, which is how the failures above were found. Linux and Windows were not built locally, so this PR's CI is the first test there.
• Local builds used Xcode's macOS 27 SDK. With conda-forge's clang 21 that SDK needs a toolchain fix, proposed in Backport removal of libc++'s <float.h> (llvm#175849) for the macOS 27 SDK; needed before clangdev-feedstock#494 conda-forge/libcxx-feedstock#294 and Backport float.h __need_infinity_nan (llvm#164348) for the macOS 27 SDK conda-forge/clangdev-feedstock#494 (applied locally to the package cache only). It is not needed for CI, whose macOS runners use an older SDK, and nothing in this PR depends on it.

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[mini-1235]

@traversaro @Tobias-Fischer @sea-bass

Ready for review! I honestly didn't expect to finish the rebuild before October (it is only about 10 hours away in my timezone) so I named the title "October" :) Feel free to change it