fix(code-to-prd): pass skill-tester validation — README, assets, frontmatter, imports
- Add README.md with quick start, framework table, output structure
- Add assets/sample-analysis.json for script testing
- Expand SKILL.md frontmatter with version, author, category, tier, dependencies
- Add Features, Usage, Examples sections to SKILL.md
- Remove __future__ imports, fix str|None → Optional[str] for Python 3.9 compat
- Validation: 65→85.7, quality: 51→62.1, scripts: 2/2 PASS
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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