Improve flow-supply-chain-analyzer template accuracy and reliability

Major improvements to the Flow Protocol supply chain security analyzer:

- Fixed JavaScript runtime errors with proper array initialization and null checks
- Enhanced dependency parsing with better regex patterns for JS/CSS extraction
- Added comprehensive SRI validation with algorithm strength assessment
- Expanded CDN coverage from 5 to 14 popular providers
- Implemented advanced malicious content detection with severity levels
- Added vulnerable library tracking for jQuery, Bootstrap, Angular with CVE references
- Enhanced security headers analysis (CSP, HSTS, X-Content-Type-Options)
- Improved HTTP request strategy with HEAD requests for efficiency
- Added proper error handling and size limits (1MB) for dependency content
- Expanded risk scoring with Critical/High/Medium/Low levels and detailed statistics
- Generated prioritized recommendations with implementation guidance
- Added comprehensive reporting with affected URL lists and vulnerability counts

The template now provides significantly better accuracy for supply chain security
analysis while maintaining defensive research principles and YAML lint compliance.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: geeknik