🧹 [de-nest string manipulation exports]

[Tcode-Motion]

🎯 What: Extracted all inline closures in register_strings into private top-level functions.
💡 Why: String operations (trim, lower, upper, etc.) are simple and stateless. Extracting them to top-level functions drastically reduces the nesting depth and overall complexity of the register_strings method, making the file much easier to read and maintain.
✅ Verification: Visually verified the refactoring via git diff and ran the full workspace test suite (cargo test --workspace --all-targets), ensuring no regressions were introduced.
✨ Result: The register_strings method is now purely focused on routing callbacks rather than implementing the string manipulation logic itself.

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PR created automatically by Jules for task 18302694219631424776 started by @Tcode-Motion

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