check-test-isolation.sh gains rule R5 (comment-stripped grep so prose
mentions of resetGateway() don't satisfy it, exact call syntax on the
trigger so test-name prose doesn't fire it). Fixes the 11 current
violators with resetGateway() in afterAll; 5 fixture cases pin the rule.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>