add new tool git-status and support for --require-clean-branch on filesystem server

Is your feature request related to a problem? Please describe.
one of the main concerns when using the filesystem server is untracked changes to files/directories. this feature allows us to ensure the files being changed are in a git repo with a clean branch before making changes.

Describe the solution you'd like
a new tool git-status that can check the working dir git status and return "clean" or "not clean" with a new flag --require-clean-branch. when set filesystem will require a clean git branch when making changes to files/dirs.

Describe alternatives you've considered
Alternatives right now: don't prompt it to do work unless you've manually checked the dir/repo status first. not great. i could ensure it's only working in git repos now with a more fine-tuned configuration. ie: allow access to less directories, but nothing prevents changes to files not yet committed.

Additional context
this would be gold.

Start by locating the filesystem server implementation, its existing tool registration, and its option or flag parsing. Trace how file and directory changes are authorized, then verify that git-status reports the requested clean or not-clean result and that --require-clean-branch enforces the stated requirement before changes are made.