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trigger_org_node(org_node, prompt, target_folder_path): shells out `claude --agent <org_node> -p ... --permission-mode auto` with cwd=target project, parses the JSON result, raises OrgNodeTriggerError on nonzero exit or is_error. Skeleton only, per development-plan.md ("不含完整状态机") -- TASK_NOT_READY/CONCURRENCY_LIMIT_REACHED/USAGE_LIMIT_REACHED handling is U-010's job. Also refactors test_agent_e2e.py (U-004) to call this real function instead of its own ad-hoc subprocess invocation, so the gated real-agent test now exercises U-005's actual production code path -- confirmed still passing against a real `claude --agent planner` call. 5 new mocked stdlib unittest cases (CLAUDE.md Testing constraint: mock the subprocess boundary in normal tests). 46 total across U-001-005, all passing; the 1 gated real-agent test re-verified manually. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>