维护者确认: #2107 feat(goal): Goal run 结构化观测事件 + 6 类终态测试收口

PR [#2107](https://github.com/makecindy/cindy/pull/2107) 触发维护者确认门。

**触发原因:**
- product: feat 类型（新功能需要维护者确认产品方向）
- arch: 核心路径改动 333 行 ≥ 150（apps/desktop/src/main/goal-host/）

**改动概述:** 为 Goal run 添加结构化观测事件和 6 类终态测试。涉及 goal-host controller、runEvents 模块新增。

**确认方式:** 维护者在 PR 上 Approve 即通过；需要修改就 Request Changes，作者改完后重新 Approve 即放行。

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关联 PR:#2107(作者 @KingSystemHaiGo);本 issue 由 review-pr 流程自动创建,用于先讨论该 PR 涉及的产品 / UI 变更,维护者确认后 PR 会恢复推进。

Review PR #2107 and the core path under apps/desktop/src/main/goal-host/, including the goal-host controller and runEvents module. Check the product and UI implications of the structured observation events and six terminal-state tests; this issue is done when a maintainer approves the PR, or when requested changes are addressed and approved.

Written by the indexing model from the issue text.