- Go/Rust: run the unindexed .dat tail repair on noWriteCanDelete volumes
too — deletes still append tombstone records, so the same crash window
applies and they previously degraded to fully read-only.
- Go readTailNeedle: reject a positive size of 1-3 for v2+ as corrupted
before ReadBytes slices the body's 4-byte data-size field and panics;
a torn last record is now cut instead of crashing the load.
- Tests: TestVolumeLoadRepairsTailOnCanDeleteVolume and
TestVolumeLoadCutsDamagedSmallSizeTailOnCanDeleteVolume (Go), and the
Rust mirrors volume_load_repairs_tail_on_can_delete_volume /
volume_load_cuts_damaged_small_size_tail.
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