Add Comprehensive Documentation for core-pre Crate

[google-labs-jules]

This commit introduces a new, detailed README.md for the core-pre crate. The new documentation provides a comprehensive overview of the crate's architecture, data flow, performance bottlenecks, and potential optimizations. It also includes a review of the error handling strategy with suggestions for improvements.

The existing README.md, which was focused on the testing framework, has been renamed to TESTING.md to preserve its content while making the new README.md the primary entry point for the crate.

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