- unit: config basis-path normalization (trailing slash, a//b, ./x/./y collapse;
degenerate inputs rejected).
- integration: same-size/same-mtime/different-content fixtures prove the xxHash
gate -- the basis changed.txt now has the SAME byte size as the source so the
size short-circuit can no longer mask the hash comparison, plus a dedicated
parametrized same-size mismatch test asserting link/copy never use a
content-mismatched basis and compare-dest transfers.
- basis-dir priority is first-match-wins: two link-dest dirs (inode of the
first), and compare-dest before link-dest stays sparse while the reverse
order hard-links.
- --size-only links a same-content basis file with a different mtime;
--ignore-times never links even an exact match.
- --delay-updates + --delete removes extras inside a nested .fastsync-stage
dir (regression guard) while keeping the real staging dir and basis tree.
- a basis run containing a file above the whole-file limit fails up front with
a clear error and transfers nothing.
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