Implements Task 10 doc updates. README/CLAUDE/role-README now reflect that all
task files + play_bootstrap/play_backup are implemented and idempotency-verified,
that vlans is built+validated but its device run is deferred (placeholder topology,
on-site recovery needed), and that the bootstrap/backup plays exist. Corrects the
bootstrap invocation example (-e ansible_user=admin --ask-pass).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
