Stabilize pre-commit clang-format by pinning toolchain in hook config

[Copilot]

The pre-commit GitHub Actions job was failing on clang-format due to environment-dependent formatter behavior. This change removes runner/toolchain drift by making pre-commit own and pin the formatter version.

• Root issue

  • clang-format ran via a local system hook, so CI behavior depended on whatever version apt resolved on the runner.
  • This caused formatting deltas in CI (files were modified by this hook) even when local checks appeared clean.

• What changed

  • Pinned clang-format in pre-commit
    • Replaced the local language: system clang-format hook with pre-commit/mirrors-clang-format at v14.0.6.
    • Kept -fallback-style=none behavior.
  • Simplified CI workflow
    • Removed explicit apt install clang-format from .github/workflows/format.yml.
    • Workflow now relies on the pinned pre-commit-managed formatter.

• Config shape after change

  - repo: https://github.com/pre-commit/mirrors-clang-format
    rev: v14.0.6
    hooks:
      - id: clang-format
        args: ["-fallback-style=none"]

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[Copilot]

Pull request overview

This PR stabilizes the repository’s formatting checks by moving clang-format from a runner-dependent system install to a pre-commit-managed, pinned version, ensuring consistent formatting results across local runs and CI.

Changes:

• Replaces the local language: system clang-format hook with pre-commit/mirrors-clang-format pinned to v14.0.6.
• Removes the GitHub Actions step that installed clang-format via apt, relying on pre-commit to provide the formatter.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.pre-commit-config.yaml	Pins clang-format via pre-commit/mirrors-clang-format@v14.0.6 and keeps -fallback-style=none.
.github/workflows/format.yml	Simplifies CI by removing the apt install clang-format step and running pre-commit directly.

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