Self-hosted evoo-ci runners can retain listeners on harness ports
(3110 API, 5180 web, 4321 marketing, 3111 device control) after a
failed run, causing EADDRINUSE before the next job. Add a guarded
free-e2e-ports.sh that uses fuser on Linux only and never touches
live dev ports 3100/5173. Wire it into the Playwright workflow and
the E2E harness with clear logging.
Co-authored-by: cynarAI <cynarAI@users.noreply.github.com>