Cherry-pick from upstream

• Upstream commit: 712e23172
• Author: Peter Steinberger [email protected]
• Tier: AUTO-PICK
• Issue: Cherry-pick: Agent Delivery & Session Context #658 (Batch 5)

Summary

Forwards the resolved outbound session context from agentCommand to deliverAgentCommandResult, so that delivery uses the pre-built session context rather than re-deriving it. This ensures consistent session context (key + agentId) is available for outbound payload delivery.

Conflict Resolution

Three files had rebrand-related conflicts:

• agent.ts: Import conflict (fork uses middleware imports instead of getRemoteSkillEligibility; added buildOutboundSessionContext import alongside fork imports). ACP block conflict (fork gutted the ACP execution path; kept fork's empty block — the outboundSession additions to the two remaining deliverAgentCommandResult call sites auto-merged).
• agent.test.ts: Fork removed runCliAgentSpy (gutted CLI runner spy); kept only the new deliverAgentCommandResultSpy addition.
• delivery.ts: Import changed from function to type-only (OutboundSessionContext); kept fork's AgentDeliveryResult import. Destructuring merged: added outboundSession to params destructuring while preserving fork's resultMeta block.

Cherry-picked-from: 712e231