Phase 1: Populate reusedCode from USWDS and CMS Design System dependencies

[haseebmalik18]

Problem

The reusedCode field, which lists government software a project reuses, is left empty by the generator and has to be filled in by hand.

Solution

Detect government-made dependencies from package.json and requirements.txt and populate reusedCode automatically.

• src/gov-dependencies.ts — curated map of gov dependencies; Phase 1 covers USWDS and the CMS Design System
• helper.ts — detectReusedCode matches manifest deps against the map, and mergeReusedCode merges them into existing entries while keeping manual edits and avoiding duplicates on re-run
• wired into getMetaData in main.ts

Scope

This PR is Phase 1: USWDS and the CMS Design System. Phase 2 grows the list using federal npm orgs, CISA .gov data, keywords, and SBOMs. Phase 3 cross-checks against the federal source-code inventory.

Test Plan

npm test and npm run lint pass. Added unit tests for parsing, detection, alias de-duplication, and merge.

Related: #124

[haseebmalik18]

@natalialuzuriaga