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/lesson-quiz/README.md

@@ -0,0 +1,69 @@
+# Lesson Quiz
+
+> Interactive quiz that tests your understanding of a specific Claude Code lesson with 10 questions, per-question feedback, and targeted review guidance.
+
+## Highlights
+
+- 10 questions per lesson mixing conceptual understanding and practical application
+- Covers all 10 lessons (01-Slash Commands through 10-CLI)
+- Three timing modes: pre-test, progress check, or mastery verification
+- Per-question feedback with correct answers and explanations
+- Targeted review recommendations pointing to specific lesson sections
+- 100-question bank across all lessons in `references/question-bank.md`
+
+## When to Use
+
+| Say this... | Skill will... |
+|---|---|
+| "quiz me on hooks" | Run a 10-question quiz on Lesson 06: Hooks |
+| "lesson quiz 03" | Test your knowledge of Lesson 03: Skills |
+| "do I understand MCP" | Assess your understanding of Lesson 05: MCP |
+| "practice quiz" | Let you pick a lesson, then quiz you |
+
+## How It Works
+
+```mermaid
+graph TD
+    A["Select lesson"] --> B["Choose timing: pre/during/after"]
+    B --> C["Answer 10 questions in 5 rounds"]
+    C --> D["Score and review feedback"]
+    style A fill:#4CAF50,color:#fff
+    style D fill:#2196F3,color:#fff
+```
+
+## Usage
+
+```
+/lesson-quiz [lesson-name-or-number]
+```
+
+Examples:
+```
+/lesson-quiz hooks
+/lesson-quiz 03
+/lesson-quiz advanced-features
+/lesson-quiz           # (prompts for lesson selection)
+```
+
+## Output
+
+### Score Report
+- Total score out of 10 with grade (Mastered / Proficient / Developing / Beginning)
+- Breakdown by question category (conceptual vs. practical)
+
+### Per-Question Feedback
+For each incorrect answer:
+- What you answered vs. the correct answer
+- Explanation of why the correct answer is right
+- Specific section of the lesson to review
+
+### Timing-Aware Guidance
+- **Pre-test**: Establishes baseline, highlights areas to focus on while studying
+- **During**: Identifies what you've grasped and what to revisit
+- **After**: Confirms mastery or pinpoints remaining gaps
+
+## Resources
+
+| Path | Description |
+|---|---|
+| `references/question-bank.md` | 100 pre-written questions (10 per lesson) with answers, explanations, and review pointers |