docs: make styling cookbook library-agnostic + add validation workflow

[himerus]

Summary

• Replaces all hardcoded sl-* Shoelace prefixes with generic my-* examples (CLAUDE.md mandate: no framework assumptions)
• Adds Recipe 6: Slot Styling with light DOM patterns and font/layout inheritance note
• Adds self-referential var() and initial anti-patterns to the quick reference
• Adds validation workflow section referencing styling_preflight and suggest_fix

Test plan

• Context file is valid markdown
• No code changes

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between a19bf71 and 0b0fdf8.

📒 Files selected for processing (2)

• .automaker/context/styling-cookbook.md
• .changeset/library-agnostic-cookbook.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/library-agnostic-cookbook

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