Keep expected readlink and follow-up lstat failures as typed entry omissions,
including the observed path and errno. Retain directory metadata and sibling
observations, distinguish known identity replacements, and keep cancellation
and unexpected I/O failures terminal. Reuse admitted root metadata and test
cancellation by descriptor state rather than a count of named lookups.
Adapt the symlink race handling proposed in #4587 at fae4e25539.
Closes#4575
BREAKING CHANGE: Filesystem enumeration omission reasons now also include
entry_unavailable and identity_changed. Clients validating the old literal
reason must accept the expanded capture schema.
Co-authored-by: rudrakshagarwal4200-ai <rudrakshagarwal4200@gmail.com>
morluto
c85b44e1b1