Replace the single hardcoded signed-out check with a guards list on each
firm: any guard can trip mid-run via a URL substring (checked on every
step) or a selector probe (checked when a step fails). Each guard defines
recovery steps or a human-wait fallback, a per-run trigger cap, and a
resume policy — 'continue' retries the tripped step, 'restart' rewinds
the run to step 1.
Runner bumped to 0.20.0; the server still ships the legacy
signedOut/authSteps shape for stale runners, and a new runner synthesizes
a guard from a legacy payload.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
