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

---

Summary by cubic

Adds a path-scoped editing guide that auto-loads when working on CLAUDE.md or AGENTS.md to keep these files focused and high-signal. Also cleans up formatting in the agent sync script with no behavior changes.

• New Features

  • Adds .claude/rules/claude-md-guide.md targeting CLAUDE.md and AGENTS.md.
  • Clarifies where guidance belongs (root vs. subtree files, skills, rules, hooks).
  • Defines what to include (non-obvious, non-rot-prone, non-rediscoverable, not duplicated) and what to cut.

• Refactors

  • Reformats scripts/sync_agent_config.py for readability (multiline key lists, wrapped regex and messages).
  • No logic or validation changes.

^{Written for commit b4690da. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 2 files

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