feat: let agents read supervisor story graphs

Expose saved decisions, timelines and source evidence through read-only Story Graph tools across Model, Harness and local/remote OpenCode and Continue. Supervisor enablement and runtime assignments govern discovery and calls; reads do not invoke models or modify stored evidence. Remote use requires matching Desktop and Agent changes.

Make Continue discussion show the complete editable message with a separated destination and shared action layout. Sending uses the visible draft without reattaching removed context.

Validation: existing focused MCP, runtime, controlled Linux Host, discussion component and Electron layout checks plus typechecks; staged diff check passed. Cross-scope fact reuse, historical reconstruction and full package acceptance remain deferred.

Release note: Agents can consult saved supervisor decisions and their sources when continuing work. Continue discussion now lets you review and edit the complete message before sending.

docs/features/conversation-supervision/logic-design.md

@@ -172,6 +172,8 @@ flowchart LR
 
 ## 完整性与待定项
 
+FR-S11、US-S28 至 US-S31 的规则由[时态 Story Graph MCP 设计](./story-graph-mcp-design.md)统一定义：时间／确认与有效性见第 3 节，读取范围与分页见第 4 节，应用关闭与 Runtime 接入见第 6 节，跨 scope 复用与记忆过渡见第 7、8 节。D1 读取已接入，后两项仍待实现；Global／项目独立 checkpoint 和同 scope 候选身份保留。MCP 不接受 `as_of`，较晚生成的结果也不自动使旧决定失效。
+
 本设计覆盖触发、证据输入、静默检查、正常整理、取消与失败、跨视图共享结果、用户纠正、知识库写入及历史回放。它补充产品逻辑，不代表接口、持久化或迁移方案已经完成。
 
 仍待产品决策：事件触发与阶段识别条件、反馈频率与静默判定、实体合并与拆分的交互、时间轴比例和集中度含义。应用启停按[应用启停与执行](#应用启停与执行)处理；既有入口偏好、计划与运行记录的保留要求见 FR-S1、S2 和 US-S14。