feat: expand tutorial with coding agents intro and self-paced module

[stevenjmiklovic]

This pull request was created by @kiro-agent on behalf of @stevenjmiklovic 👻

Comment with /kiro fix to address specific feedback or /kiro all to address everything.
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Summary

Expands the Kanon tutorial knowledge artifacts to serve as an introduction to coding agents, skills, and harnesses, and creates a standalone self-paced learning module.

Changes

• 4 new conceptual lessons (Lessons 1–4) prepended to tutorial.md:
  • Lesson 1: What Are Coding Agents? — plain-language intro with before/after example
  • Lesson 2: Understanding Skills and Artifact Types — 8 types table, decision criteria, JHU scenarios
  • Lesson 3: How Harnesses Work — "author once, compile to many" with side-by-side comparison
  • Lesson 4: Getting Started with Skill Creation — bridge lesson with "I can…" readiness checklist
• Existing 16 lessons renumbered to 5–20 with all navigation updated (ToC, Lesson Index, Next links)
• New Self-paced Module (workflows/self-paced-module.md) with:
  • Abstract (95 words), Learning Outcomes (6, Bloom's taxonomy), Self-Assessment Checklist, Format section
  • 6 detailed module lessons from concepts through hands-on CLI exercises
• knowledge.md updated with module reference and accurate 20-lesson tutorial description
• Property-based validation tests (11 properties, 29 tests) — all passing

Testing

• bun test tests/tutorial-expansion.property.test.ts — 29 tests pass covering structural integrity, content bounds, navigation chain, and format consistency

Notes

• Lessons 1–4 contain zero code (no backticks, no CLI commands) per design constraint
• The self-paced module complements but does not duplicate the tutorial's introductory lessons
• Spec documents included at .kiro/specs/tutorial-expansion/

[amazon-q-developer]

Summary

This PR successfully expands the Kanon tutorial with 4 new conceptual lessons introducing coding agents, skills, and harnesses, creating a structured learning path from concepts to hands-on practice. All 29 property-based validation tests pass, confirming structural integrity and content quality.

Key Changes

• ✅ 4 new conceptual lessons (1-4) with zero code examples as designed
• ✅ Existing lessons renumbered to 5-20 with all navigation updated
• ✅ New self-paced module with formal learning outcomes
• ✅ Comprehensive test coverage validating content structure and constraints

The implementation is solid with no blocking issues identified.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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