Developer tools default on after preference resolution
偏好解析后默认开启开发者工具
New installations need access to developer views, preset selection, change summaries and interactive HTML previews without first finding a Settings switch. A saved disabled preference must still prevent those features from activating during startup, including script execution that cannot be undone after it occurs.
English
Problem
New installations need access to developer views, preset selection, change summaries and interactive HTML previews without first finding a Settings switch. A saved disabled preference must still prevent those features from activating during startup, including script execution that cannot be undone after it occurs.
Decision
The Host schema defaults ui-developer-tools.enabled to true. Remote browsers with process-local preferences also start enabled. Saved Host values take precedence, including false. This supersedes only the initial default-off choice in Shared developer-tool settings; that note retains ownership of shared persistence and rendering policy.
Host-backed clients publish disabled until an accepted schema-resolved value arrives. Loading, failed initial reads and an unavailable namespace do not grant interactive-preview capabilities. The Host supplies the default for an absent stored field; the client does not interpret an absent response as consent to enable scripts. An accepted value remains authoritative during later refreshes.
Only the Trajectory tab follows the developer-tools preference; third-party Views remain available. The conversation shell retains the explicit Trajectory id because the requested rule names that View. No current requirement makes arbitrary diagnostic Views share the switch.
Alternatives considered
Keep the default off. This minimizes the initial interface but requires a separate opt-in for the features new installations now expose. Users can still save the disabled preference.
Default the Host client to enabled before settings arrive. This makes rendering immediate, but briefly activates features for users who disabled them. Unmounting a scripted HTML iframe cannot undo scripts or requests already executed.
Add a generic developer-tool flag to View registration. This expands the plugin API and allows other Views to join a switch whose current requirement is specific to Trajectory. A future requirement can justify that API separately.
Consequences
Fresh profiles expose developer features after settings resolve; users with a saved disabled choice retain the simpler presentation. New users also receive interactive HTML previews with the capabilities documented by the filesystem-read authority. Host initialization can briefly withhold developer controls even when the eventual preference is enabled.
Settings tests cover initial withholding, unavailable namespaces, explicit disabled values and process-local defaults. HTML renderer coverage checks that pending and disabled preferences neither read related files nor create script-enabled frames. Browser settings coverage verifies the default and a disabled choice across reload; document-preview replay pins the explicitly disabled scenario.
中文
Problem
新安装需要直接使用开发者视图、预设选择、改动摘要和交互式 HTML 预览，无需先寻找设置开关。已保存的关闭偏好仍必须阻止这些功能在启动期间激活，包括发生后无法撤销的脚本执行。
Decision
Host schema 将 ui-developer-tools.enabled 默认为 true。使用进程内偏好的远程浏览器也从开启状态启动。已保存的 Host 值优先，包括 false。这仅取代共享开发者工具设置中最初默认关闭的选择；该记录继续负责共享持久化和渲染策略。
使用 Host 偏好的客户端在收到经过 schema 解析并接受的值之前发布关闭状态。加载中、首次读取失败和命名空间不可用均不授予交互式预览能力。缺少存储字段时由 Host 提供默认值；客户端不会把缺少响应解释为允许开启脚本。后续刷新期间，已接受的值继续有效。
只有 Trajectory 标签页受开发者工具偏好控制；第三方 View 保持可用。对话外壳保留显式 Trajectory id，因为当前需求明确指定此 View。没有现行需求要求任意诊断 View 共用该开关。
Alternatives considered
保持默认关闭。 这可简化初始界面，但新安装现在直接提供的功能将需要额外启用。用户仍可保存关闭偏好。
在设置到达前让 Host 客户端默认开启。 这可以立即渲染，却会短暂激活用户已关闭的功能。卸载可执行脚本的 HTML iframe 无法撤销已经执行的脚本或请求。
在 View 注册中增加通用开发者工具标记。 这会扩展插件 API，并允许其他 View 加入当前仅针对 Trajectory 的开关。未来需求可以单独论证该 API。
Consequences
新 profile 在设置解析后展示开发者功能；已保存关闭选择的用户保留简化展示。新用户也会获得带有文件系统读取权限所述能力的交互式 HTML 预览。即使最终偏好为开启，Host 初始化期间也可能短暂不展示开发者控件。
设置测试覆盖首次等待、命名空间不可用、显式关闭值和进程内默认值。HTML 渲染器覆盖验证等待中及关闭偏好均不读取关联文件，也不创建允许脚本的 frame。浏览器设置覆盖验证默认值和关闭选择在刷新后保持；文档预览回放固定显式关闭的场景。