docs(client): document trajectory conversation assembly

.agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.md
-2026-07-24-web-gui-browser-e2e-lane.md: e572929ae6762da6adc2e77e1dba19361beaf670
-2026-07-24-web-gui-browser-e2e-lane.zh.md: 99f86f40ba006c4024f367b73ce52f8679b8d2fd
+2026-07-24-web-gui-browser-e2e-lane.md: 6e52d96a8adb5486e8666d65a3425bf5a0aad4a9
+2026-07-24-web-gui-browser-e2e-lane.zh.md: 7598a8edc530a34261799e57ce953edafe44e70e

.agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.md

@@ -88,7 +88,7 @@ Surveyed AI-chat/agent web UIs and mocking layers (LibreChat, vercel/ai-chatbot
 - **Follow-up-prompt-after-resume scenario**: the history/live stitch path over the real wire; add as its own scenario when that code changes or regresses.
 - **Composer steering gesture**: the input locks while running (stop-or-wait), so the steering scenario steers over the wire from the page; `TODO(web-steer-composer)` upgrades the drive step to a real composer gesture when the product grows one.
 - **Drag session reorder**: `workspace.insertSessionBefore` has no browser scenario; it needs two sessions materialized in one workspace plus synthesized HTML5 drag events. Add it when that surface changes or regresses. The inert session Rename/Fork/Delete and workspace Delete menu rows get scenarios when they gain behavior.
-- **Long-history Chat-to-Trajectory Inspect**: the independent inspection source exhausts history after the view opens, while the selected record is addressed by a derived table index that can move as older pages prepend. Short-history Inspect remains covered; the long-history interaction contract excludes this handoff until selection has a stable semantic identity.
+- **Long-history Chat-to-Trajectory Inspect**: both views share Session paging, while the selected Trajectory record is addressed by a derived table index that can move as older pages prepend. Short-history Inspect remains covered; the long-history interaction contract excludes this handoff until selection has a stable semantic identity.
 
 ## Consequences
 

.agents/notes/implemented/testing/2026-07-24-web-gui-browser-e2e-lane.zh.md

@@ -88,7 +88,7 @@ Web GUI 以一条真实组装链交付——chromium 页面 → client 插件 bu
 - **恢复后追问场景**：真实 wire 上的历史/实时缝合路径；当该代码变更或回归时作为独立场景补充。
 - **输入框 steering 手势**：输入在运行期间锁定（只能停止或等待），因此 steering 场景从页面走 wire 做 steer；`TODO(web-steer-composer)` 待产品长出真实的输入框手势后，把驱动步骤升级为该手势。
 - **拖拽会话重排**：`workspace.insertSessionBefore` 尚无浏览器场景；它需要在同一个工作区里物化两个会话，并合成 HTML5 拖拽事件。当该表面变更或回归时再补充。无行为的会话 Rename/Fork/Delete 和工作区 Delete 菜单行待获得行为后再补充场景。
-- **长历史 Chat 到 Trajectory 的 Inspect**：独立的检查数据源会在视图打开后穷尽历史，而所选记录由一个派生的表格索引定位；随着较早页面前插，该索引可能移动。短历史 Inspect 仍有覆盖；在选中项具有稳定的语义身份之前，长历史交互约定不包含这项交接。
+- **长历史 Chat 到 Trajectory 的 Inspect**：两个视图共用 Session 分页，而所选 Trajectory 记录由一个派生的表格索引定位；随着较早页面前插，该索引可能移动。短历史 Inspect 仍有覆盖；在选中项具有稳定的语义身份之前，长历史交互约定不包含这项交接。
 
 ## 后果