fix(buffers): recover disk_v2 from durable checkpoints#25845

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graphcareful wants to merge 14 commits into

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graphcareful:fix/disk-v2-checkpoint-window-recovery

Commits on Jul 20, 2026

fix(buffers): drop over-limit disk_v2 records instead of crashing
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fix(buffers): drop oversized records as Delivered, not Rejected
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fix(buffers): don't corrupt occupancy or redeliver oversized records
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fix(buffers): preserve finalizers when returning oversized record for retry
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fix(buffers): treat serializer-internal inconsistency as fatal, not per-record
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fix(buffers): meter sender usage from write outcomes
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Fix doc comment
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fix(buffers): make Finalizable::merge_finalizers compiler-enforced
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fix(buffers): restore buffer benchmark build
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revert(buffers): remove pre-entry drop accounting
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fix(buffers): balance oversized disk drop usage
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perf(buffers): avoid hot-path size_of for oversized-record drop reporting
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fix(buffers): reconcile disk_v2 checkpoint window on restart
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fix(buffers): clean up disk_v2 data files asynchronously
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