fix(init): resolve hooks path relative to repo root

Ensure that `core.hooksPath` is resolved relative to the repository root
of the main worktree, or the git dir if it is bare (git itself uses the
same logic).

Author: ethanwu10

git-branchless-lib/src/core/config.rs

@@ -54,7 +54,17 @@ pub fn get_main_worktree_hooks_dir(
     let hooks_path = if result.exit_code.is_success() {
         let path = String::from_utf8(result.stdout)
             .context("Decoding git config output for hooks path")?;
-        PathBuf::from(path.strip_suffix('\n').unwrap_or(&path))
+
+        let parent_repo = repo.open_worktree_parent_repo()?;
+        let main_repo = parent_repo.as_ref().unwrap_or(repo);
+
+        let path = PathBuf::from(path.strip_suffix('\n').unwrap_or(&path));
+
+        main_repo
+            .get_working_copy_path()
+            .as_deref()
+            .unwrap_or_else(|| main_repo.get_path())
+            .join(path)
     } else {
         get_default_hooks_dir(repo)?
     };