Remove the entire multi-agent collaboration execution path, including:
- MultiAgentOrchestrator and its 4-phase pipeline (Architect→Engineer→Tester→Iteration)
- ARIS framework preset and mount infrastructure
- Hardcoded model defaults (kimi-k2.5, minimax-m2.7, glm-5)
- Deprecated runCliPromptInternal() and its fallback call chain
- All related types: MultiAgentConfig, AgentWorkerConfig, MultiAgentRole, etc.
This collapses the architecture to a single clean path:
Flutter → GoTaskServiceClient → ACP Transport → Go Bridge → Remote Execution
2886 lines removed across 41 files.
