Attribute reader scroll input through the observed-top ledger
ChatView's bottom-follow recognized only wheel gestures as reader input, so touch panning, scrollbar dragging, and keyboard paging could not leave the bottom of a streaming transcript. Replace the wheel listener with device-agnostic attribution: a scroll position deviating from the observed-top ledger of the last delivered or written scrollTop is reader input. Adds keyboard-paging and touch-style fling e2e scenarios (red under the old implementation) and the bilingual Agent Note triplet.
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# side as of the last confirmed-consistent state. Both languages carry equal authority;
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# after editing either side, bring the other along and re-record with:
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# pnpm run verify-translation-pairing --write .agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.md
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2026-07-24-web-gui-browser-e2e-lane.md: f8519a9622d2f7216226a695db95dbebdbf24ea1
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2026-07-24-web-gui-browser-e2e-lane.zh.md: 294f3e840e0242d9a0d9c53ac510d44d3b0d100f
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2026-07-24-web-gui-browser-e2e-lane.md: 095ad9055c8462ecec67609ed9af55df2a2d7adb
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2026-07-24-web-gui-browser-e2e-lane.zh.md: eb20ee378eb5154bafcb7a448202c66dacda9199
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@@ -42,7 +42,7 @@ The typecheck plane split is structural: the host scaffold, its support module,
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### Coverage contract
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The lane covers three behavior families. Live-turn scenarios pin ordinary tool execution, cancellation, non-retryable failure, transient retry, resident questions, and mid-turn steering; synchronization uses durable events, `whenIdle()`, or an explicit replay marker rather than delays. Cold-history scenarios seed through the real persistence API and cover history rendering, sidebar search, trajectory and waterfall views, and tool details without model calls. Browser-lifecycle scenarios cover first-send workspace materialization, reload recovery, layout reset, theme and locale preferences, and workspace create/rename/view operations. Each family asserts the browser surface and the authoritative host state; a stray model call or under-consumed fixture fails teardown. The required lane additionally carries an 88-turn synthetic Chat scroll contract mixing wrapped Markdown, fenced code, and paired bash calls/results. Real wheel, composer, tool, tab, session, and viewport interactions assert a named settled row's top relative to the transcript scrollport and distance from the true bottom across concurrent history prepend plus paced streaming, pinned/away streaming, tool-disclosure offscreen cycles, expanded-history view/session remount, width reflow, immediate pinned remount, composer resize, and textarea wheel chaining; it deliberately pins neither DOM cardinality nor absolute `scrollTop`, so the same contract can qualify a virtualized implementation. A separate interaction contract over the same fixture pins heterogeneous-row order, independent adjacent tool disclosure, exact user-message clipboard content, a turn-bounded message fork, source/child isolation, and a real follow-up turn in the child; wheel input only navigates to semantic targets and carries no geometry expectation. A short live-history contract starts from a blank workspace and drives consecutive composer turns, including real bash call/result rounds and a paced long final response, pinning one session identity, exact per-turn event ownership, browser echo uniqueness, and composer recovery without timing thresholds.
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The lane covers three behavior families. Live-turn scenarios pin ordinary tool execution, cancellation, non-retryable failure, transient retry, resident questions, and mid-turn steering; synchronization uses durable events, `whenIdle()`, or an explicit replay marker rather than delays. Cold-history scenarios seed through the real persistence API and cover history rendering, sidebar search, trajectory and waterfall views, and tool details without model calls. Browser-lifecycle scenarios cover first-send workspace materialization, reload recovery, layout reset, theme and locale preferences, and workspace create/rename/view operations. Each family asserts the browser surface and the authoritative host state; a stray model call or under-consumed fixture fails teardown. The required lane additionally carries an 88-turn synthetic Chat scroll contract mixing wrapped Markdown, fenced code, and paired bash calls/results. Real wheel, composer, tool, tab, session, and viewport interactions assert a named settled row's top relative to the transcript scrollport and distance from the true bottom across concurrent history prepend plus paced streaming, pinned/away streaming, tool-disclosure offscreen cycles, expanded-history view/session remount, width reflow, immediate pinned remount, composer resize, and textarea wheel chaining; real keyboard paging and a touch-style fling emulation additionally pin wheel-free bottom-follow ownership ([reader-scroll-attribution note](../bug-fix/2026-08-06-reader-scroll-attribution-observed-top-ledger.md)); it deliberately pins neither DOM cardinality nor absolute `scrollTop`, so the same contract can qualify a virtualized implementation. A separate interaction contract over the same fixture pins heterogeneous-row order, independent adjacent tool disclosure, exact user-message clipboard content, a turn-bounded message fork, source/child isolation, and a real follow-up turn in the child; wheel input only navigates to semantic targets and carries no geometry expectation. A short live-history contract starts from a blank workspace and drives consecutive composer turns, including real bash call/result rounds and a paced long final response, pinning one session identity, exact per-turn event ownership, browser echo uniqueness, and composer recovery without timing thresholds.
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### CI stance
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@@ -42,7 +42,7 @@ Web GUI 以一条真实组装链交付——chromium 页面 → client 插件 bu
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### 覆盖契约
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该车道覆盖三类行为。实时轮次场景钉住普通工具执行、取消、不可重试失败、瞬态重试、常驻提问与轮次中途 steering；同步依赖持久事件、`whenIdle()` 或显式回放标记，而不使用延时。冷历史场景通过真实持久化 API 播种，在不调用模型的情况下覆盖历史渲染、侧栏搜索、Trajectory 与 Waterfall 视图及工具详情。浏览器生命周期场景覆盖首次发送时物化工作区、重新加载恢复、布局重置、主题与语言偏好，以及工作区的创建、重命名和视图操作。每类场景都断言浏览器表面和权威的 host 状态；离群的模型调用或未耗尽的 fixture 会使拆卸失败。必需车道还包含一份合成的 88 轮 Chat 滚动契约，其中混合了换行 Markdown、围栏代码以及成对的 bash 调用/结果。真实 wheel、输入框、工具、tab、会话与 viewport 交互会在并发历史前插加带节奏流式输出、贴底/离底流式输出、工具 disclosure 离屏循环、扩展历史后的视图/会话重新挂载、宽度重排、贴底后立即重新挂载、输入框尺寸变化以及 textarea wheel 链场景中，断言一个具名已结算行相对 transcript scrollport 的顶部位置和到真实底部的距离；它刻意不钉 DOM 基数或绝对 `scrollTop`，因此同一契约可以验收虚拟化实现。另一份基于同一 fixture 的交互契约钉住异构行顺序、相邻工具 disclosure 的独立状态、用户消息剪贴板内容的精确值、以轮次为边界的消息 fork、源会话/子会话隔离，以及子会话中的一次真实追问轮次；wheel 输入只用于导航到语义目标，不承载几何预期。一份简短的实时历史契约从空白工作区开始，连续驱动输入框轮次，其中包括真实的 bash 调用/结果轮次和一段带节奏的长篇最终响应；它钉住单一会话身份、每轮事件的精确归属、浏览器回显唯一性与输入框恢复，不设置时间阈值。
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该车道覆盖三类行为。实时轮次场景钉住普通工具执行、取消、不可重试失败、瞬态重试、常驻提问与轮次中途 steering；同步依赖持久事件、`whenIdle()` 或显式回放标记，而不使用延时。冷历史场景通过真实持久化 API 播种，在不调用模型的情况下覆盖历史渲染、侧栏搜索、Trajectory 与 Waterfall 视图及工具详情。浏览器生命周期场景覆盖首次发送时物化工作区、重新加载恢复、布局重置、主题与语言偏好，以及工作区的创建、重命名和视图操作。每类场景都断言浏览器表面和权威的 host 状态；离群的模型调用或未耗尽的 fixture 会使拆卸失败。必需车道还包含一份合成的 88 轮 Chat 滚动契约，其中混合了换行 Markdown、围栏代码以及成对的 bash 调用/结果。真实 wheel、输入框、工具、tab、会话与 viewport 交互会在并发历史前插加带节奏流式输出、贴底/离底流式输出、工具 disclosure 离屏循环、扩展历史后的视图/会话重新挂载、宽度重排、贴底后立即重新挂载、输入框尺寸变化以及 textarea wheel 链场景中，断言一个具名已结算行相对 transcript scrollport 的顶部位置和到真实底部的距离；真实键盘翻页与触摸式惯性滑动模拟额外钉住不依赖 wheel 的贴底跟随所有权（[读者滚动归因笔记](../bug-fix/2026-08-06-reader-scroll-attribution-observed-top-ledger.md)）；它刻意不钉 DOM 基数或绝对 `scrollTop`，因此同一契约可以验收虚拟化实现。另一份基于同一 fixture 的交互契约钉住异构行顺序、相邻工具 disclosure 的独立状态、用户消息剪贴板内容的精确值、以轮次为边界的消息 fork、源会话/子会话隔离，以及子会话中的一次真实追问轮次；wheel 输入只用于导航到语义目标，不承载几何预期。一份简短的实时历史契约从空白工作区开始，连续驱动输入框轮次，其中包括真实的 bash 调用/结果轮次和一段带节奏的长篇最终响应；它钉住单一会话身份、每轮事件的精确归属、浏览器回显唯一性与输入框恢复，不设置时间阈值。
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### CI 立场
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