ojs-ruby-sdk v0.2.0

• chore: bump version to 0.2.0
• feat: add connection pool support for multi-threaded workers
• feat: implement configurable retry backoff
• refactor: extract HTTP client into reusable module
• perf: reduce memory allocations in hot path
• refactor: simplify client initialization logic
• fix: correct error handling in graceful shutdown
• fix: handle connection timeout in HTTP client
• chore: update dependency versions
• fix: correct signal handling in worker process

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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