internal/

Package engine is the supervisor: it owns run creation, subprocess execution, the auto-execution of run_command operations, response acceptance, and terminal handling.

Package guard owns every protocol refusal.

Package protocol defines the yield.v1 wire protocol: the typed operation envelopes a skill program yields to the coding agent, and the response envelopes the agent (or yskill itself) feeds back.

Package runlog is the append-only event log that owns every run's state.