get_attached_policies_with_reasons rescanned the sorted matches with next() once
per distinct policy, which is quadratic and misses the one second budget past a
few thousand global attachments. Build a policy to broadest attachment map in one
pass instead, keeping the specificity sort and result order.
Co-authored-by: yucheng <yucheng@berri.ai>
Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>