Refactors the NLI logic to use chain-of-command

[EddieMachete]

Closes #49

[Copilot]

Pull request overview

This PR refactors the Neurological Level of Injury (NLI) calculation module to use a step-based chain-of-command pattern, aligning it with the architectural approach used in other classification modules (motorLevel, sensoryLevel). The refactor maintains complete backward compatibility while enabling step-by-step visualization of the algorithm for clinical education and auditing purposes.

Changes:

• Refactored neurologicalLevelOfInjury.ts from procedural for-loop to step-based architecture with initializeNLIIteration and checkLevel step handlers
• Added 900+ lines of comprehensive tests covering step handlers, generator function, and integration scenarios
• Added extensive documentation with clinical examples, algorithm explanations, and developer guides

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/en.ts	Added 9 translation keys for NLI step descriptions and actions, following established naming conventions
src/classification/neurologicalLevelOfInjury/neurologicalLevelOfInjury.ts	Refactored from procedural to step-based architecture; preserved existing check functions; added step handlers, generator, and state management
src/classification/neurologicalLevelOfInjury/neurologicalLevelOfInjury.spec.ts	Expanded from 150 to 1061 lines; added comprehensive tests for step handlers, generator, and integration scenarios; removed skipped test (xdescribe)
src/classification/neurologicalLevelOfInjury/README.md	Added 677-line clinical documentation explaining algorithm, step-by-step logic, bilateral evaluation, and usage examples
docs/neurologicalLevelOfInjury-architecture.md	Added 637-line architecture document detailing step definitions, state types, check functions, and implementation guidance

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