Document each PROVIDER_PATTERNS entry with real User-Agent examples,
add inline comments to BROWSER_INDICATORS and NON_AGENT_BOTS with
categorised UA examples, document MCP_TOKEN_HEADER with token format
details, and add class-level usage examples and detection priority
ordering.
Closes#31
Refs: DOC-001
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>