fix: complete DS_UNSAFE_FAST_FSYNC rename; drop concluded contention-investigation doc - #4690

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fix/unsafe-fast-fsync-segment

Commits on Jul 6, 2026

fix: complete DS_UNSAFE_FAST_FSYNC rename in wal/segment.rs

balegas
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claude
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chore: add changeset for the fast-fsync rename fix

balegas
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claude
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docs: remove the WAL contention investigation tracking doc

balegas
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claude
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