cargo-mutants-style probe C26 (the resume backoff read without its longest
wait) survived: the clock-step test called is_waiting directly, not the resume
site. An Engine-level test now sets a real half-minute backoff, which holds,
and a day-ahead one, which is attempted.
docs/host-actuator.md said continuity gives up after three attempts; it is six
restarts inside an hour.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
