ojs-ruby-contrib v0.2.0

• chore: bump version to 0.2.0
• feat: add OpenTelemetry tracing support
• docs: update contrib guidelines
• feat: add Prometheus metrics middleware
• docs: add Sidekiq migration guide
• feat: add Rails ActiveJob adapter for OJS backend
• feat: add structured logging middleware
• feat: add OpenTelemetry middleware integration
• refactor: simplify middleware registration API
• fix: correct metric label cardinality issue
• docs: add integration guide for Prometheus metrics
• refactor: simplify middleware registration
• test: add adapter integration tests
• fix: correct thread pool shutdown in Sidekiq bridge
• feat: add Rails ActiveJob adapter

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What's Changed

See the full release notes: https://github.com/openjobspec/openjobspec/blob/main/RELEASE_NOTES_v0.2.0.md