Here are the data structures with brief descriptions:

Cconfig	`machinatrix`-specific configuration
Cmtrix_buffer	Resizable buffer used by several functions
Cmtrix_cmd	Structure that associates a mtrix_cmd_f to a command
Cmtrix_config	Configuration structure used by all programs
Cmtrix_hasher	Wraps a value with methods to compute hashes of several types
Cmtrix_numeraria_cmd	Format of each command packet
Cpost_request	Data used for `POST` requests
Cstats	Accumulates lookup statistics
Cwikt_page	Relevant elements of a page