Function tree_diff_contents_parallel 

pub fn tree_diff_contents_parallel(
    odb: &Odb,
    entries: Vec<DiffEntry>,
    config: &ConfigSet,
    thread_policy: &ThreadPolicy,
) -> Result<Vec<TreeDiffContent>>

Load old/new blob bytes for each entry, using a worker pool when thresholds allow.

Submodule gitlinks are synthesized as Subproject commit <oid> lines; missing sides are empty. Order matches entries.

Errors

Propagates object database read failures.