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- Add Custom Grammars (.claude-mem.json) section explaining how to register additional tree-sitter parsers for unsupported file extensions - Add Markdown Special Support section documenting heading-based outline, code-fence search, section unfold, and frontmatter extraction behaviors - Expand bundled language test to cover all 10 documented languages plus the plain-text fallback sentence to prevent partial doc regressions Co-Authored-By: Claude <noreply@anthropic.com>