Add a per-platform circuit breaker that trips when a monitor task's final
account fails over with risk_control / challenge_required /
authorization_failed. Tripping cancels the platform's remaining pending
local monitor tasks (aborted with a cancellation summary) and blocks new
ones until an account probes healthy or a fresh account is bound. Adds
cancelPendingMonitorTasksForPlatform to the monitor scheduler plus tests.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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