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- 根因：高亮框（body 下 data-genarrative-preview-inspect，position:fixed）被尺寸上报的 measureContentBounds 遍历计入内容尺寸；three 投影盒超出画布时把内容尺寸撑到 3756×2643（视口 900×560），宿主改 iframe 尺寸触发游戏 resize 重算相机，形成自激振荡 - 桥：measureContentBounds 的 TreeWalker 对 data-genarrative-preview-fit / data-genarrative-preview-inspect 返回 FILTER_REJECT（桥自己的节点不参与内容测量） - 桥：新增 clipInspectRect，引擎档（three 投影盒、Phaser 世界包围盒）命中矩形统一裁剪到画布可见范围；与画布无交集时退化为指针点矩形（不出现 0/负尺寸） - 测试：新增 localPreviewInspectSizeStability.test.ts（5 例：桥节点不参与测量、同尺寸普通节点仍计入的对照组、进入检查模式与 hover 后尺寸与宿主适配布局不变、投影盒超出画布时载荷被裁剪、与画布无交集时退化为 1×1）；runtimeInspectEngines 的字段换算用例改到画布内的等价参数（原矩形落在画布外，裁剪后按新规则退化为指针点矩形） - 文档：pitfalls 记一条「高亮框被尺寸上报当成页面内容」的根因、口径与回归