Senpi Trading Runtime — the runtime contract

This skill is infrastructure: the canonical knowledge of how the Senpi runtime (@senpi-ai/runtime) behaves and how a strategy interacts with it. The lifecycle skills — author (build), ops (install/monitor), discover (recommend) — reference this one for the contract.

The runtime model

A strategy runs from a runtime.yaml that points at an in-repo Python module. The runtime spawns and supervises that module and calls a frozen scan(inputs, ctx) every interval_seconds. The division of labor is fixed: