persistence 2

dsh plugin: register locally-defined custom agents (~/.dsh/agents/*.md) as callable subagents via the use_agent tool

PostgreSQL durable backend family for DeepSeek Harness — session persistence + storage-domain KV backends, both over PostgreSQL. Includes a Settings console for connection config and bidirectional migration (JSONL ⇄ PostgreSQL for sessions; JSON ⇄ Postgre