feat: Add adaptive learning path with self-assessment and lesson quiz skills

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.

.claude/skills/self-assessment/README.md

@@ -0,0 +1,73 @@
+# Self-Assessment & Learning Path Advisor
+
+> Comprehensive Claude Code proficiency assessment that evaluates 10 feature areas, identifies skill gaps, and generates a personalized learning path to level up.
+
+## Highlights
+
+- Two assessment modes: Quick (8 questions, 2 min) and Deep (5 rounds, 5 min)
+- Evaluates 10 feature areas: Slash Commands, Memory, Skills, Hooks, MCP, Subagents, Checkpoints, Advanced Features, Plugins, CLI
+- Per-topic scoring with mastery levels (None / Basic / Proficient)
+- Gap analysis with dependency-aware prioritization
+- Personalized learning path with specific exercises and success criteria
+- Follow-up actions: start learning, deep dive, practice project, or retake
+
+## When to Use
+
+| Say this... | Skill will... |
+|---|---|
+| "assess my level" | Run the assessment quiz and determine your level |
+| "where should I start" | Evaluate your experience and suggest a starting point |
+| "check my skills" | Produce a detailed skill profile across all 10 areas |
+| "what should I learn next" | Identify gaps and build a prioritized learning path |
+
+## How It Works
+
+```mermaid
+graph TD
+    A["Choose assessment mode"] --> B["Answer quiz questions"]
+    B --> C["Score per-topic proficiency"]
+    C --> D["Generate personalized learning path"]
+    D --> E["Start learning or deep dive"]
+    style A fill:#4CAF50,color:#fff
+    style E fill:#2196F3,color:#fff
+```
+
+## Assessment Modes
+
+### Quick Assessment (~2 min)
+- 8 yes/no experience questions across 2 rounds
+- Determines overall level: Beginner / Intermediate / Advanced
+- Lists specific gaps with tutorial links
+- Best for: first-time users, quick check-ins
+
+### Deep Assessment (~5 min)
+- 5 rounds of questions covering 10 feature areas (2 topics per round)
+- Per-topic scoring (0-2 points each, 20 points total)
+- Mastery table with strength areas, priority gaps, and review items
+- Dependency-aware learning path with phases and time estimates
+- Recommended practice projects combining gap topics
+- Best for: experienced users wanting to level up, periodic skill reviews
+
+## Usage
+
+```
+/self-assessment
+```
+
+## Output
+
+### Skill Profile Table
+Shows per-topic score, mastery level, and status (Learn / Review / Mastered).
+
+### Personalized Learning Path
+- Organized into phases based on dependency order
+- Each topic includes: tutorial link, focus areas, key exercise, success criterion
+- Time estimate adjusted for topics already mastered
+- Practice projects combining multiple gap areas
+
+### Follow-up Actions
+After results, choose to:
+- Start the first gap tutorial with guided exercises
+- Deep dive into a specific gap area
+- Set up a practice project covering your gaps
+- Retake in a different assessment mode