docs(todo): consolidate the sentry-cluster tasks

Merged the two no-session /schedule tasks (the sentry variant and the unattended inbox check) into one "Unattended /schedule cron contract". They were the same design problem stated for two consumers. Added a foundational "Cross-host agent coordination" task capturing the shared prerequisite behind the roam-conflict task and the two blocked sentry passes: agent-lock is host-local, so nothing coordinates ratio and velox. Cross-linked both dependents to it.

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