4e3da49116
Add agent_task_sessions table for per-task session state keyed by (agent, adapter, taskKey). Add AgentTaskSession type, resetAgentSessionSchema validator, and sessionDisplayId/sessionParamsJson to AgentRuntimeState. Rework migration hash-resolution fallback ordering to prefer hash-based matching over timestamp-based journal matching. Move backup-db.sh logic into packages/db/src/backup.ts for programmatic use and simplify the shell script to call the TypeScript implementation. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>