grep: support GNU regex escape extensions portably (#78) (#85) #65

	name: Tiger Style

	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]
	workflow_dispatch:

	# Pre-empt the June 2 2026 GitHub Actions Node 24 cutover. Forces all
	# JS-based actions (setup-just, etc.) to run on Node 24 regardless of
	# their action.yml-declared runtime.
	env:
	FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true

	concurrency:
	group: tiger-style-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	tiger-check:
	timeout-minutes: 5
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
	- uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # v4
	# Tree-wide gate, not a diff against the base. The Tiger Style
	# migration brought every gating rule to zero, so the whole tree
	# must stay clean. This is strictly stronger than `--base`: it also
	# catches a function that crosses the 70-line limit on lines the PR
	# did not touch (e.g. a body that grows past an unchanged signature),
	# which a diff-only check would miss. usize-arch is reported but
	# non-gating. Genuine dual-use lines use an inline `tiger:allow:<rule>`
	# comment. The scanner needs no toolchain (POSIX sh + awk/grep) and
	# no git history, so the default shallow checkout is fine.
	- name: Scan for Tiger Style violations (tree-wide gating rules)
	run: just tiger-check

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