docs(roadmap): R-88 — an unreachable backup target reads as "no backup exists"

Observed live on demo-felhom 2026-07-27 07:02:57 UTC: an agent restart while the
offsite PBS service was down produced a doomed vzdump at that tier. R-84's
read-error fallback to the in-memory record is correct alone but empty after a
restart, so "cannot read the storage" resolved to "no backup has ever been
taken" = due. Same class R-81 fixed in the hub, one layer down in the agent:
unreachable must be UNKNOWN, not resolved.
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2026-07-27 09:08:46 +02:00
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commit eb3f0b8d3f
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