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Parley: full-stack messaging sample, WebRTC and ECDH/HKDF in core #4307

	name: Check control characters

	# A raw control byte in a source file is invisible in an editor and turns the
	# file binary to grep, which then reports "no match" instead of an error -- a
	# search comes back empty and reads as "the symbol is not there". Every
	# language here has an escape that compiles to the same value, so the gate is
	# absolute: no baseline, no exclusions.
	#
	# Deliberately its own workflow rather than a step in pr.yml: that workflow's
	# paths filter excludes scripts/ and docs/, so a PR touching only those
	# would skip the check -- and this tree has had a corrupted file in each.

	permissions:
	contents: read

	on:
	workflow_dispatch:
	pull_request:
	branches:
	- master
	push:
	branches:
	- master

	concurrency:
	# Only the latest revision needs validation. PR numbers keep forks isolated;
	# event names keep a manual/scheduled run from cancelling a push or PR run.
	group: ${{ github.workflow }}-${{ github.event_name }}-${{ github.event.pull_request.number \|\| github.ref }}
	cancel-in-progress: true

	jobs:
	check-control-characters:
	runs-on: ubuntu-24.04
	steps:
	- uses: actions/checkout@v6

	- name: Scan tracked text files for raw control characters
	shell: bash
	run: scripts/check-control-characters.py