Investigate metadata system: lifecycle, plugin resolution, config vs metadata

Detailed investigation of how Datasette's metadata system works including:
- Full startup lifecycle from file parsing through internal DB population
- How plugins interact with metadata via set_*/get_* methods
- Critical ordering issue: startup hooks fire before internal DB tables exist
- Last-write-wins resolution when file metadata conflicts with plugin metadata
- Complete enumeration of all 23 config settings and all metadata keys
- How config and metadata YAML differ and the automatic migration system

https://claude.ai/code/session_011DcgBtkS6ba1xLGQbcgWFm