Chumbo 0.8.1

A cosmetic package release that completes the Chumbo repository transition.\n\n- Publishes canonical elsheppo/chumbo repository, homepage, and issue links in npm metadata.\n- Carries the merged Chumbo documentation, roadmap, and living-reference cleanup.\n- Preserves the existing runtime behavior and compatibility aliases.\n- Leaves the deployed living reference pinned to its verified 0.8.0 receipt.\n\nThere are no runtime behavior changes in this patch.