Brace Expansion for CLAUDE.md Paths

What: Glob-style brace expansion in CLAUDE.md frontmatter configuration

How to use:

paths: src/{components,utils}/{*.ts,*.tsx}

Expands to:

src/components/*.ts
src/components/*.tsx
src/utils/*.ts
src/utils/*.tsx

Details:

• Custom implementation supporting nested braces
• Recursive expansion for complex patterns
• Used in CLAUDE.md frontmatter paths: field
• Evidence: nP0() at line 52984, aP0() at line 53002 in pretty-v2.0.41.js (not present in v2.0.37)