Adds a dedicated provider entry for opencode's Zen proxy on top of the existing OpenAI-compatible codec, with its own config wiring in harness-app and harness-core::config::load.
Adds the jobs pane to the TUI with a new snapshot test, subtask drill-in navigation, and periodic reminders injected into the engine loop for long-running background jobs.
Lets subagents report context files back to the job board (surfaced from the read tool) so the parent session's next-turn context includes what a background child has been looking at.
Adds the task tool and subagent spawner in harness-tools, and wires spawning/aliasing/reuse and depth limits through harness-app and the job board, so an orchestrator session can launch and track child sessions.
Adds harness-core::engine::jobs, the JobBoard tracking foreground/background subagent jobs with persistence, plus permission-rule intersection so a spawned subagent's effective permissions are the parent's rules narrowed by its own.
darman