feat: Improve output quality and documentation

- Remove AI-looking emojis, use professional text indicators [!], [~], [OK]
- Restore helpful context in timeline and effort descriptions
- Add PLANNING section for available vulnerable algorithms
- Smart JWT remediation: recommend waiting for PQ-JWT standards
- Context-aware Ed25519 guidance based on signature use case
- Only show detailed remediation for CONFIRMED findings
- Comprehensive README rewrite with SEO optimization
- Document reachability analysis feature
- Add FAQ, installation options, CI/CD examples

Author: thebenignhacker