[codex] package adoption-router skill artifact

[xiaojiou176]

Summary

• add a registry-shaped manifest.yaml for the shared cortexpilot-adoption-router skill inside the coding-agent bundle
• sync bundle/examples/distribution/docs wording so Codex, Claude Code, and OpenClaw can be described as consuming one manifest-backed cross-tool skill artifact
• record the new skill-packaging truth in the changelog without overclaiming any live registry or marketplace listing

Test Plan

• ruby -e 'require "yaml"; data = YAML.load_file("examples/coding-agents/plugin-bundles/cortexpilot-coding-agent-bundle/skills/cortexpilot-adoption-router/manifest.yaml"); abort("missing keys") unless %w[name version homepage repository license status].all? { |k| data.key?(k) } && data.dig("entrypoints", "skill_markdown") == "SKILL.md" && data.dig("compatibility", "openclaw", "published_listing") == false; puts data["name"]; puts data["status"]; puts data.dig("distribution_notes", "current_claim")'
• npm run docs:check
• bash scripts/check_repo_hygiene.sh

Screenshots

• None (docs / metadata only)

Breaking Changes

None

Rollout / Risk

• Risk level: Low
• Rollback: Revert this PR to remove the manifest-backed skill packaging wording and artifact

Observability

• No runtime behavior changes
• No new logs or metrics

Checklist

• Self-reviewed code
• No debug/print statements left
• No TODO without issue reference
• Documentation updated (if needed)
• Tests added/updated as needed for this metadata/docs slice