Function resolve_commit_ref 

pub fn resolve_commit_ref(repo_path: &Path, reference: &str) -> Result<String>

Resolves a git reference (SHA, HEAD, branch name, etc.) to a full commit SHA.

Supports:

• Full and partial SHAs
• HEAD and HEAD~N syntax
• Branch names
• Tag names

Arguments

• repo_path - A path inside the git repository
• reference - The git reference to resolve (SHA, HEAD, branch, tag, etc.)

Errors

Returns an error if the repository cannot be found or the reference cannot be resolved to a valid commit.