Stub overview. This is a multi-page project: the landing page introduces the project, then each chapter covers one component of the runtime (Probe, Record, Monitor, Paint). The full content is being drafted and ported in.

The runtime is a three-stage pipeline: data flows from ROOT TTrees into the Probe layer, through user analysis callbacks, into the Record writer that buffers fill requests through a worker pool and merges per-thread clones at the end of the run. The Monitor layer runs a heartbeat thread that handles progress rendering, stall detection, and checkpoint signalling.