simple-git without baseDir inherits process.cwd(), so launching
OpenChamber from a neutral directory (e.g. $HOME) and opening a git
project elsewhere produced repeated "not a git repository" status
errors and could abort project/session enumeration. Always require an
explicit baseDir, soft-handle non-repo GitErrors on status/check
routes, and cover non-git, foreign-cwd, and nested-repo cases.
Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>
