Feature-gated parent-agent read and draft APIs for the staged multi-leg agent rollout
v2.agents.* namespace is the canonical staged surface for parent-agent
summary, detail, lifecycle, and draft bootstrap flows.
POST /v1/trpcv2.agents.*multi_leg_agents_v1 feature flagv2.agents.listv2.agents.getv2.agents.pausev2.agents.resumev2.agents.archivev2.agents.drafts.commitv2.agents.drafts.startFromAgentmulti_leg_agents_v1=true for the
caller.authored_agent_sdk does not expose the route by itself. It only enables
authored draft behavior within the already-enabled parent-agent surface.create entrypoint in this namespace.
Initial authoring continues to flow through the staged v2.workflows.* draft
surface until later rollout slices unify the product entrypoints.