- Fix Railtie loading so cdc/solid_queue/railtie loads the main CDC::SolidQueue API.
  - Add CDC::SolidQueue::CLI.start for Rails task delegation.
  - Add regression coverage for direct Railtie loading.
  - Add Rails app example with real PostgreSQL logical replication setup.
  - Add local smoke tests and enqueue benchmark.
  - Document benchmark interpretation and example workflows.
  - Update release workflow to publish to RubyGems.org.