fix(presim): drop tip state when canon notifications stall#527
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If no `CanonStateNotification` arrives for 30s, drop the held `TipState` so its `StateProvider` (and the underlying MDBX read transaction) is released. During a long sync the previous behavior pinned a single read tx for the entire gap, blocking page reclamation / pruning and tripping MDBX's "long read transaction (300s)" warnings. - `TopOfBlockSimulator::clear_tip` releases the held state provider - `maintain_tip_state` now wraps `events.next()` in a 30s timeout; on elapsed it calls `clear_tip` once and warns. Resumption is debug-logged - Demoted the "no tip state" log in `simulate_tx_sync` from warn -> debug since None is now an expected state during sync (would otherwise warn per pending tx for the full sync window) - New counter `presim_tip_state_evictions`
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If no CanonStateNotification arrives for 30s, drop the held TipState so its StateProvider is released