Add clang-format config tuned to KLayout C++ style #1

	---
	name: clang-format

	# Verifies that all C/C++ sources are formatted according to .clang-format.
	# Fails if any tracked source would be changed by clang-format.
	#
	# Uses the community jidicula/clang-format-action. The clang-format version is
	# pinned to match .clang-format / local tooling, since output drifts across
	# major versions. testdata (golden fixtures) and src/gsiqt (machine-emitted Qt
	# bindings) are excluded, mirroring .clang-format-ignore.

	on:
	pull_request:
	push:
	branches:
	- master

	permissions:
	contents: read

	concurrency:
	group: clang-format-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	formatting-check:
	name: Check C++ formatting
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v7
	- name: Run clang-format style check
	uses: jidicula/clang-format-action@v4
	with:
	exclude-regex: "(testdata\|gsiqt)/"

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