feat: 🛤️ dual-track learning, community files, testing guide, failure handling

- Add Developer (🧑‍💻) and Non-Developer (🎨) learning tracks
- Refactor Lesson 1: verify install instead of teaching it (user is already running CLI)
- Add 4 non-developer lessons (writing, planning, understanding code, summaries)
- Add advanced developer lesson (MCP, skills, models)
- Add CLI glossary for non-technical users
- Add reset/restart tutorial support
- Add concise Q&A mode for quick questions
- Add failure handling (offline docs, SQL errors, unclear input)
- Consolidate SKILL.md to single source with symlink
- Add CONTRIBUTING.md, CODE_OF_CONDUCT.md, CHANGELOG.md
- Add TESTING.md with 6 conversation playbooks and QA checklist
- Add issue templates (bug, feature, lesson idea) and PR template
- Update PRD with dual-track mermaid diagrams
- Update README with dual-track tables, architecture diagram, new structure

Author: web-flow

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,31 @@
+---
+name: 🐛 Bug Report
+about: Something isn't working right? Let us know!
+title: "[Bug] "
+labels: bug
+assignees: ''
+---
+
+## 🐛 What happened?
+
+A clear description of what went wrong.
+
+## 🔄 Steps to reproduce
+
+1. Run `copilot`
+2. Say `...`
+3. See error/unexpected behavior
+
+## ✅ What should have happened?
+
+What you expected to see instead.
+
+## 📸 Screenshots / Terminal Output
+
+If applicable, paste the terminal output or a screenshot.
+
+## 🖥️ Environment
+
+- **OS:** (macOS / Linux / Windows)
+- **Copilot CLI version:** (`copilot --version`)
+- **Lesson/Mode:** (Tutorial Lesson #, Q&A, etc.)

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,27 @@
+---
+name: 💡 Feature Request
+about: Got an idea to make the tutor better?
+title: "[Feature] "
+labels: enhancement
+assignees: ''
+---
+
+## 💡 What's your idea?
+
+A clear description of what you'd like to see.
+
+## 🤔 Why would this help?
+
+How would this improve the learning experience?
+
+## 📝 Possible approach
+
+If you have thoughts on how to implement this, share them here!
+
+## 🎯 Which track does this apply to?
+
+- [ ] 🧑‍💻 Developer track
+- [ ] 🎨 Non-developer track
+- [ ] Both tracks
+- [ ] ❓ Q&A mode
+- [ ] Other

.github/ISSUE_TEMPLATE/lesson_idea.md

@@ -0,0 +1,25 @@
+---
+name: 📚 Lesson Idea
+about: Suggest a new lesson topic for the tutor!
+title: "[Lesson] "
+labels: lesson-idea
+assignees: ''
+---
+
+## 📚 What should the lesson teach?
+
+Describe the concept or skill you'd like covered.
+
+## 🎯 Who is this for?
+
+- [ ] 🧑‍💻 Developers
+- [ ] 🎨 Non-developers
+- [ ] Both
+
+## 📋 What would the exercise look like?
+
+Describe a hands-on exercise the user could try after learning.
+
+## 🔗 Any resources?
+
+Links to docs, examples, or references that would help write this lesson.

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,27 @@
+## 📝 What does this PR do?
+
+Brief description of the change.
+
+## 🔗 Related Issue
+
+Closes #
+
+## 🎯 Type of Change
+
+- [ ] 🐛 Bug fix
+- [ ] ✨ New feature / lesson
+- [ ] 📝 Documentation update
+- [ ] 🔧 Maintenance / refactor
+
+## 🧪 Testing
+
+- [ ] I've tested this against the [TESTING.md](../TESTING.md) playbooks
+- [ ] I've verified the conversation flow works end-to-end
+- [ ] I've checked that existing lessons still work
+
+## 📋 Checklist
+
+- [ ] Tone is fun, friendly, and uses emojis 🎉
+- [ ] No assumed CLI knowledge for non-developer track 🐣
+- [ ] CHANGELOG.md updated
+- [ ] No fabricated information — all facts verified ✅