docs(roadmap): correct R-88 severity — it is a repeating quiesce loop, not one event

Measured on demo-felhom while the offsite PBS service was down: the controller
re-polls /backup/due every ~5 min, still gets 'due' (storage unreachable + cold
store), and runs the FULL quiesce cycle each time — all four customer app stacks
stopped and restarted for a backup that cannot succeed. ~19 s of app downtime per
cycle, unbounded. The first entry called this bounded and event-only; it is an
availability fault.
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2026-07-27 09:10:19 +02:00
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commit 5aca709ca1
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