Capture fields

Capture identifiers connect a state row to the agent run and generation that produced it.

Field	Type	Unit	Meaning
sparklogs.capture.id	string		The capture generation's name, a readable constant telling a consumer which topics ship together.
sparklogs.capture.generation_id	string		One sampling pass's opaque id, stamped identically on every topic read in that pass. The sound way to join sibling topics: the state loop reads the clock once per wake, so equal timestamps do not prove a shared generation.