Add CLAUDE.md editing guide for path-scoped rules

[Miyamura80]

Summary

• Adds .claude/rules/claude-md-guide.md — a path-scoped rule that auto-loads when editing CLAUDE.md or AGENTS.md
• Provides guidance on what content belongs in context-critical files vs. nested files, skills, rules, or hooks
• Establishes criteria for what earns its place and what to cut

Mirrors MCP-Template#49.

Test plan

• Verify .claude/rules/claude-md-guide.md exists with correct frontmatter
• Confirm rule auto-loads when opening CLAUDE.md or AGENTS.md

🤖 Generated with Claude Code

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Summary by cubic

Added .claude/rules/claude-md-guide.md, a path-scoped rule that auto-loads when editing CLAUDE.md or AGENTS.md to guide what belongs in root docs vs. nested files, skills, rules, or hooks. Updated .gitignore to track the /.claude/rules/ directory.

^{Written for commit e10e010. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

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