fix(quickjs): propagate JS task() subagent interrupts

[Mason Daugherty (mdrxy)]

QuickJS exposes a JavaScript task() helper so an eval can fan out work to Deep Agents subagents, but that helper was not quite equivalent to the normal task tool path. When a JS-launched subagent hit HITL, the nested GraphInterrupt was caught and rendered as an eval error instead of reaching LangGraph’s normal interrupt machinery; the bridge also skipped the parent runtime config and child tool call id when invoking the underlying task tool.

Changes

• Preserve the parent ToolRuntime.config and pass a synthetic child tool_call_id when call_subagent_task_tool invokes the Deep Agents task tool. This keeps subagent dispatch closer to the normal ToolNode path, including config-driven behavior such as thread/run metadata and runtime context propagation.
• Let GraphInterrupt bubble through both the subagent helper and the QuickJS task() bridge. Other validation/runtime failures are still wrapped as eval errors, but LangGraph interrupts remain control-flow signals rather than being converted into <error type="GraphInterrupt">....