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Added comprehensive GraphQL mutations for CRUD operations on markdown files and schemas. Key features: - Complete mutation schema with structured payload types - Markdown file mutations: add, update with front matter support - Schema mutations: add, update, delete with JSON validation - CLI integration with `graphql-mutate` command - Comprehensive error handling and validation - Full test coverage with 24 test cases - Updated documentation with mutation examples and API usage Resolves issue #10: Expose a GraphQL Write Interface 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>