Add JSDoc for diff parser, language loader, payload guard, and cn helper

[baanish]

Motivation

• Improve code discoverability by documenting runtime expectations and failure/fallback behavior for several low-level helpers.
• Make the git patch parsing, language detection/loading, class merging, and payload envelope guard behavior explicit for future maintainers.
• Preserve existing behavior while clarifying input/output contracts for functions used across renderers and payload handling.

Description

• Add JSDoc for parseGitPatchBundle in src/lib/diff/git-patch.ts describing unified-patch input, multi-file diff --git section splitting, rename/copy and binary detection, path normalization, deterministic ${displayPath}-${index} output IDs, and empty-input fallback.
• Add JSDoc for detectCodeLanguage and loadLanguageSupport in src/lib/code/language.ts documenting that explicit language overrides filename inference, the filename-extension mapping, supported aliases, dynamic import behavior, and null/text fallbacks when unsupported.
• Add JSDoc for cn in src/lib/utils.ts explaining that clsx normalization is combined with tailwind-merge to resolve conflicting Tailwind utilities and noting ignored invalid inputs.
• Add JSDoc for isPayloadEnvelope in src/lib/payload/schema.ts clarifying that it is a structural runtime shape guard validating top-level fields and per-artifact minimal requirements while not performing full semantic normalization.

Testing

• Ran npm run lint and the lint step completed successfully.

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Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (4 files)

• src/lib/code/language.ts - JSDoc added to 2 functions
• src/lib/diff/git-patch.ts - JSDoc added to 1 function
• src/lib/payload/schema.ts - JSDoc added to 1 function
• src/lib/utils.ts - JSDoc added to 1 function

This PR adds JSDoc documentation comments to 5 existing functions. The changes are purely additive with no runtime code modifications. No security issues, logic bugs, or other concerns were identified.