Exclude unstable windows-2025-vs2026 leg from Boost.CI matrix

[Copilot]

The failing Boost.CI Windows job (msvc-14.5, c++17/20/latest, 32/64-bit on windows-2025-vs2026) was failing with MSVC heap exhaustion (fatal error C1060) while compiling OpenMethod test sources.
This PR narrows the matrix to avoid that runner image while keeping the rest of the CI surface unchanged.

• CI matrix adjustment

  • Added exclude_os: windows-2025-vs2026 to the reusable Boost.CI workflow inputs in .github/workflows/ci.yml.
  • No compiler/version/standard filters were changed beyond removing this specific OS image leg.

• Scope

  • Workflow-only change; no library or test source modifications.

jobs:
  call-boost-ci:
    uses: boostorg/boost-ci/.github/workflows/reusable.yml@master
    with:
      exclude_cxxstd: '98,03,0x,11,14'
      exclude_compiler: gcc-4.9,gcc-5,gcc-6,gcc-7,clang-3.9,clang-4.0,clang-5.0,clang-6.0,clang-7,clang-16
      exclude_os: windows-2025-vs2026

[cppalliance-bot]

An automated preview of the documentation is available at https://76.openmethod.prtest3.cppalliance.org/libs/openmethod/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-06-13 17:35:48 UTC