Redesign LEARNING-ROADMAP.md with a self-assessment quiz that routes users
to Beginner/Intermediate/Advanced paths instead of a single linear track.
Add two project-local skills:
- self-assessment: comprehensive proficiency quiz (quick or deep mode)
covering 10 feature areas with per-topic scoring and personalized
learning paths
- lesson-quiz: per-lesson quiz with 100-question bank (10 per lesson)
for pre-test, progress check, or mastery verification
Update README.md learning path table with "Recommended For" column and
quiz link. Update .gitignore to track project skills.
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