Add coding-tutor plugin to marketplace (#61)

Personalized coding tutorials that build on your existing knowledge
and use your actual codebase for examples. Includes spaced repetition
quizzes to reinforce learning.

- 3 commands: /teach-me, /quiz-me, /sync-tutorials
- 1 skill: coding-tutor

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

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

plugins/coding-tutor/README.md

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+# Coding Tutor
+
+Your personal AI tutor that creates tutorials tailored to you - using real code from your projects, building on what you already know, and tracking your progress over time.
+
+## Why
+
+AI is already smarter than any single human being across the breadth of tasks it can perform. It beats PhDs, aces entrance exams in every field, and this gap will only widen.
+
+In this world, humans have two paths: let their cognitive capabilities decline, or rise to match AI. The long-term future of humanity depends heavily on which path we take.
+
+My belief is simple: today's AI is smarter than any private tutor anyone on the planet can hire. So why not use it to give every human access to the best personal tutor imaginable? One that knows your background, adapts to your pace, uses your actual work as teaching material, and helps you retain what you learn.
+
+This project starts with programming - the domain where AI has the most immediate economic impact. Use it to learn about the programs you're vibe coding and level up your skills. Don't just vibe code, vibe learn.
+
+## Install
+
+```
+/plugin install coding-tutor@claude-code-essentials
+```
+
+## Features
+
+- Personalized onboarding to understand your learning goals
+- Tutorials that use YOUR code as examples
+- Spaced repetition quiz system to reinforce learning
+- Tracks your progress across tutorials
+- Curriculum planning based on your current knowledge
+
+## Commands
+
+- `/teach-me` - Learn something new
+- `/quiz-me` - Test your retention with spaced repetition
+- `/sync-tutorials` - Sync your tutorials to GitHub for backup
+
+## Storage
+
+Tutorials are stored at `~/coding-tutor-tutorials/`. This is auto-created on first use and shared across all your projects. The `source_repo` field in each tutorial tracks which codebase the examples came from.