- Add sessionHandoff field to PromptContext interface and Session Handoff section in buildSystemPrompt - Add getSessionHandoff dependency to orchestration service, load handoff before prompt build - Update orchestration to prefer task_sessions table over legacy tasks.session_json (SESS-01) - Wire getSessionHandoff through ServiceGraph into createOrchestrationService Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>