Update README for edit precision and assessment CLI docs

[matdev83]

Summary

• document the top-k override options for edit-precision tuning across CLI, env, YAML, and usage examples
• correct the LLM assessment CLI instructions to require backend:model pairs and add an explanatory note
• expand edit-precision examples to show top-k usage and update useful flags list

Testing

• not run (documentation-only change)

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Codex Task

[coderabbitai]

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• README.md

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/review-and-update-documentation-and-code

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