Function exclude_from_git 

pub fn exclude_from_git(
    worktree_root: &Path,
    filename: &str,
) -> Result<(), PawError>

Excludes a file from git tracking by adding it to info/exclude.

This prevents the file from being tracked by git without modifying the repository’s .gitignore file, which is useful for worktree-specific files that should not be committed. Idempotent: an entry already present is not duplicated.

Linked worktrees. Git reads info/exclude from the common git directory, never the per-worktree git directory, so for a linked worktree (<worktree>/.git is a file pointing at <common>/worktrees/<id>) the entry is written to the common dir’s info/exclude. Writing it to the per-worktree dir — as an earlier version did — has no effect: git silently ignores it, so the path would remain stageable.