v4.1.1 - Repo Continuity

Highlights\n\n- Renames the product to Repo Continuity and moves the canonical repository to https://github.com/vector233/repo-continuity.\n- Rewrites the English and Chinese README opening around the product's core capabilities: cross-agent recovery, focused context loading, proportional workflow, durable learning, and safe parallel work.\n- Removes release-history and breaking-change discussion from the README so the main documentation stays capability-first.\n- Updates Companion Skill display metadata, bootstrap defaults, community publishing copy, and repository metadata to the new brand.\n\n## Compatibility\n\n- The existing ai-collaboration-workflow Skill ID and payload marker remain stable.\n- GitHub redirects the previous repository URL to Repo Continuity.\n- Existing initialized projects are not modified automatically.\n\n## Validation\n\n- Full distribution lifecycle validation passes.\n- Official Agent Skill validation passes.\n- The v4.1.1 payload remains usable with Markdown and Git alone; companion tooling stays optional.