The CLI treated the second argument as a config file, preventing multiple directories from being indexed. Additionally, running the command sequentially overwrote previous data because each run reset the database.

Changes

CLI (src/bin/index.js)

• Accept multiple directory paths as positional arguments
• Identify config files by .js or .json extensions instead of position

Library (src/lib/markdowndb.ts)

• Add indexFolders() method that accumulates files from multiple directories before writing to database
• Fix watch mode path matching to handle overlapping directory names (e.g., /content and /content-backup)
• Preserve existing indexFolder() for backward compatibility

Tests (src/tests/cli.spec.ts)

• Add test verifying multiple directories index into a single database

Documentation (README.md)

• Document multi-directory usage

Usage

# Index multiple directories
npx mddb ./blog ./docs ./notes
# With config file (detected by extension)
npx mddb ./blog ./docs markdowndb.config.js
# Watch mode
npx mddb ./blog ./docs --watch

Single directory usage remains unchanged.

• Fixes Feature addition: processing multiple directories together #120

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