This release focuses on hardening the Ractor runtime and aligning `cdc-parallel` with the evolving `cdc-core` processor contract.

Highlights:

- Align processor lifecycle with `cdc-core` by starting processors before they are made Ractor-shareable.
- Add configurable supervisor options to the high-level Runtime API.
- Improve worker supervision and failure handling.
- Expand regression coverage for worker failures, supervisor recovery, lifecycle, and edge cases.
- Increase test coverage to approximately 99% line coverage and 98% branch coverage.
- Improve API documentation and YARD coverage.
- Fix RBS/Steep type validation issues and strengthen static typing.
- Various internal robustness, documentation, and test improvements.

No public API breaking changes.