R1 passed the parent's stat of a listed directory into the recursive walk,
so a recursive entry no longer took its own lstat. A directory replaced by a
symlink after that stat passed the stale directory check and readdirSync
followed the link; a directory replaced by a regular file leaked a raw
ENOTDIR instead of refusing with project-repository.
The walk now takes a root flag. The .git root keeps its raw lstat and its
own error; every recursive entry takes a fresh lstat through statEntry, so
a vanished entry still maps ENOENT to 'git metadata changed during
inspection' and a replaced one refuses with 'expected local .git directory'.
The mapper is unchanged: ENOENT only.
Two deterministic tests replace a directory under .git/objects inside the
lstat call that stats it as a listed entry, after the real stat is taken:
once with a symlink to a fixture-only directory outside the repo, once with
a regular file. Both refuse with project-repository.
jason.woltje
1977f4ffc6