Publish migration and adoption playbooks for Sidekiq, GoodJob, and Solid Queue

[niteshpurohit]

Summary

Publish migration and adoption playbooks for common Ruby job-system starting points.

Scope

• migration guidance for Sidekiq, GoodJob, and Solid Queue users
• adoption notes that explain where concepts map cleanly and where they do not
• operational and dashboard guidance needed during migration or cutover

Acceptance Criteria

• teams evaluating Karya from common Ruby alternatives have concrete migration guidance
• concept mappings and incompatibilities are explicit
• adoption playbooks align with the governed rollout and compatibility backlog