refactor: extract delegate functions from filesize for better SRP

[avoidwork]

-- By @avoidwork --
Summary

Refactor filesize() to extract responsibility into dedicated delegate functions, improving adherence to SOLID principles (specifically SRP - Single Responsibility Principle).

Changes

• Extract 5 new delegate functions in helpers.js: calculateExponent(), applyRounding(), resolveSymbol(), decorateResult(), formatOutput()
• Reduce filesize() from 285 to 242 lines with clear pipeline of delegate calls
• Move exponent calculation, rounding, symbol resolution, decoration, and output dispatch out of the main function
• All 149 tests pass with 100% coverage maintained
• Build includes generated distributions

Before

filesize() handled: validation, base config, exponent calculation, rounding, auto-increment, precision, symbol lookup, negation, custom symbols, locale/separator/padding formatting, full names, and output dispatch -- ~14 responsibilities.

After

filesize() sequences delegates: validate → getBaseConfig → handleZero → calculateExponent → calculateOptimizedValue → applyRounding → applyPrecision → resolveSymbol → decorateResult → formatOutput.

[augmentcode]

🤖 Augment PR Summary

Summary: Refactors filesize() into a delegate-driven pipeline to better isolate responsibilities and improve maintainability.

Changes:

• Extracts exponent calculation, rounding, symbol resolution, result decoration, and output dispatch into new helpers
• Simplifies src/filesize.js to orchestrate validation → exponent/value calc → rounding/precision → formatting → output
• Updates TypeScript helper declarations to expose the new delegate APIs
• Refreshes architecture/docs to describe the new orchestrator + delegates flow
• Regenerates distribution bundles and updates package metadata description

Technical Notes: The refactor aims to preserve existing output behavior while making each step independently reusable/testable.

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[augmentcode]

Review completed. 2 suggestions posted.

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[avoidwork]

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[augmentcode]

Review completed. 3 suggestions posted.

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[avoidwork]

augment review

[augmentcode]

Review completed. 1 suggestion posted.

Comment augment review to trigger a new review at any time.