洋葱模型时序图补充完整

[williamlzw]

MODEL前面只有[10]?，能否把省略号补充完整。

列表位置决定在洋葱中的层级 — 位置 0 最外层，位置 N 最内层：

进入 before_*：   [0] → [1] → [2] → ... → [10] → MODEL
退出 after_*：    MODEL → [13] → [11] → ... → [6] → [3] → [2] → [0]
                          ↑ 最内层最先执行

| # | Middleware | `before_agent` | `before_model` | `after_model` | `after_agent` | `wrap_tool_call` | 主 Agent | Subagent | 来源 |
|---|-----------|:-:|:-:|:-:|:-:|:-:|:-:|:-:|------|
| 0 | ThreadDataMiddleware | ✓ | | | | | ✓ | ✓ | `sandbox` |
| 1 | UploadsMiddleware | ✓ | | | | | ✓ | ✗ | `sandbox` |
| 2 | SandboxMiddleware | ✓ | | | ✓ | | ✓ | ✓ | `sandbox` |
| 3 | DanglingToolCallMiddleware | | | ✓ | | | ✓ | ✗ | 始终开启 |
| 4 | GuardrailMiddleware | | | | | ✓ | ✓ | ✓ | *Phase 2 纳入* |
| 5 | ToolErrorHandlingMiddleware | | | | | ✓ | ✓ | ✓ | 始终开启 |
| 6 | SummarizationMiddleware | | | ✓ | | | ✓ | ✗ | `summarization` |
| 7 | TodoMiddleware | | | ✓ | | | ✓ | ✗ | `plan_mode` 参数 |
| 8 | TitleMiddleware | | | ✓ | | | ✓ | ✗ | `auto_title` |
| 9 | MemoryMiddleware | | | | ✓ | | ✓ | ✗ | `memory` |
| 10 | ViewImageMiddleware | | ✓ | | | | ✓ | ✗ | `vision` |
| 11 | SubagentLimitMiddleware | | | ✓ | | | ✓ | ✗ | `subagent` |
| 12 | LoopDetectionMiddleware | | | ✓ | | | ✓ | ✗ | 始终开启 |
| 13 | ClarificationMiddleware | | | ✓ | | | ✓ | ✗ | 始终最后 |