hint-expiry-bounds-durability

Status: IN

Hints in `HintedHandoffStore` have a TTL; if `trigger_handoff` doesn't run before `created_at + hint_ttl`, `expire_hints` silently drops the hint, permanently losing that replica's copy of the data

Source: entries/2026/05/29/topic-sloppy-quorum-tradeoffs.md

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