Fix F_PREALLOCATE delta calculation, use x/sys/unix, keep nullseed limit - #1

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folbricht wants to merge 2 commits into

nsakaimbo:fix/nullseed-no-reflink-chunk-limitfrom

folbricht:fix/darwin-preallocate-review

Commits on Jun 7, 2026

Fix F_PREALLOCATE delta, use x/sys/unix, drop nullseed limit change
folbricht
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Add darwin ENOSPC regression test for F_PREALLOCATE delta calculation
folbricht
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