The cached git config runs its `git config` reads through raw
exec.Command calls, outside the pinned git command builder, so they
followed the process working directory. A cache miss on a stale
instance — one still in use by a refresh that crossed a repo switch —
would therefore read the new repo's local config while computing data
for the old one. Give the cache a directory, set once by NewGitCommand
right after it determines the repo paths (the object is created fresh
for every repo switch, so no cross-repo cache invalidation is needed),
and run every config command there.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
In go 1.22, loop variables are redeclared with each iteration of the
loop, rather than simple updated on each iteration. This means that we
no longer need to manually redeclare variables when they're closed over
by a function.
