fix: refresh mempool caches every block - #36
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call NotifyNewBlock unconditionally from EndBlock, made idempotent per head so two drivers cannot emit duplicate chain head events dedup chain head events per committed height
This reverts commit c6c6ebc.
Both drivers call NotifyNewBlock every block, but EndBlock of N runs before N commits, so it refreshes to the same committed height the event bus goroutine already pinned after the previous commit -- one wasted CreateQueryContext per block. Add NotifyNewBlockAt for the two drivers that know the committed height: it returns early before building a context when that height was already notified. NotifyNewBlock keeps its zero-arg always-refresh contract for callers that cannot name the height, and the post-refresh height check stays authoritative.
* check the height hint before notifyMu (atomic), so a losing driver does not wait out the winner's feed delivery just to skip * return the announced header (nil when nothing was sent), so recheck reuses it instead of rebuilding via CurrentBlock
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