Replace leftover SubTurnOrphanResultEvent and short subturn event references with runtime event kinds in comments, tests, and hook design notes.
Validation: GOCACHE=/tmp/picoclaw-go-cache go test ./pkg/agent -run TestSpawnSubTurn_OrphanResultRouting; make lint
Remove the legacy EventKind/Event envelope mapping and let agent event emission build pkg/events.Event values directly.
Keep HookMeta as the shared hook metadata shape and preserve legacy observe string aliases by mapping them to runtime event kinds.
Validation: GOCACHE=/tmp/picoclaw-go-cache go test ./pkg/agent; make lint
Mark the original hook design as an early record and update observer examples to pkg/events runtime events and hook.runtime_event.
Validation: make lint
Hoshina