Add directory exclusion support for folder CLAUDE.md generation

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Originally posted as issue #1173 by @JacobPrice
#1173

Before submitting

• I searched existing issues and confirmed this is not a duplicate

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Is your feature request related to a problem? Please describe.

The automatic folder CLAUDE.md generation creates files in directories where non-code files break tooling. Specifically, Drizzle ORM's drizzle-kit generate scans the drizzle/meta/ directory for JSON snapshot files, and when it encounters a CLAUDE.md file there, it attempts to parse it as JSON and crashes:

SyntaxError: Unexpected token '<', "<claude-me"... is not valid JSON
    at JSON.parse (<anonymous>)
    at snapshots.reduce.malformed (drizzle-kit/bin.cjs:6953:29)

This blocks all database migrations until the file is manually removed. Other issues describe a similar problem with the .git directory.

Describe the solution you'd like

A way to exclude specific directories from folder CLAUDE.md generation, similar to .gitignore. For example, a CLAUDE_MEM_FOLDER_CLAUDEMD_EXCLUDE setting or a .claudememignore file that accepts glob patterns:

{
  "CLAUDE_MEM_FOLDER_CLAUDEMD_EXCLUDE": ["drizzle/**", "dist/**", "node_modules/**"]
}

Describe alternatives you've considered

• Disable folder CLAUDE.md generation entirely (CLAUDE_MEM_FOLDER_CLAUDEMD_ENABLED: false) — loses the feature in directories where it's useful
• Manually delete the files each time they're regenerated — tedious and easy to forget