fix: prevent runtime permission stalls and Agent reconnect failures

Execute could stall on workspace-external access or native child-session
permissions, while structured questions could be lost or answered incorrectly.
Route owned OpenCode descendant interactions, correct Continue question and
custom-answer handling, and resolve DSH Execute ACP permissions without a
second approval. Ask remains read-only and unrelated sessions stay isolated.

Restore the required DSH session projection service. Reuse offline OpenCode
configuration by plugin version, remove unused npm shims from remote payloads,
normalize dependency modes, and accept real compound descriptors up to 4 MiB.
Fix intermittent Agent attach rejection and closed-handshake waits.

Add focused and real-Runtime regressions, document interaction boundaries and
validation evidence, and include the existing application/tool navigation
design drafts. Those navigation changes are design-only, not implemented UI.

Validation: full suite 3597 passed, 0 failed, 61 skipped across 338 files;
typecheck, lint, release-note verification, whitespace and relative-link checks
passed. Current-source Linux x64 installation, Ask/Execute, native subagent
external writes, reconnect and stop/bootstrap passed with 10 completed real
model calls, 13 native endpoint tests and 20 consecutive handshakes.
System sleep/wake and release CI packaging remain unverified.

Release note: 修复 Execute 访问工作区外目录或运行原生子代理时卡在权限等待的问题，并恢复 OpenCode 与 Continue 结构化问答的正确转交。修复远程 Agent 安装与重连失败；Ask 仍保持只读，任意终端密码或业务确认不会自动代答。

docs/features/deepseek-harness/technical-design.md

@@ -139,6 +139,8 @@ Harness 子进程内控制面不能取代 Main 控制面，Main 控制面也不
 - GoodBuddy 在 Runtime 重启后可以用现有的有界历史创建新 Harness Session。
 
 Harness Session 只在当前 Runtime 进程生命周期内存在。释放 GoodBuddy 会话时必须同步释放对应 Harness Agent。
+固定 Host 显式加载 `dsh-session-projection` 的内存 SessionProjectionRegistry，这是
+`0.1.2-rc.1` AgentLoop 的必需依赖；不加载 Session persistence，也不新增磁盘会话副本。
 
 ## 6. 总体架构
 
@@ -290,6 +292,10 @@ GoodBuddy 的工作模式属于每个请求，不属于 Runtime 进程全局状
 5. 缺少准备状态、重复使用、请求标识不匹配时，Control Plane 直接拒绝请求。
 6. 同一 Session 只允许一个 Prompt 在途。
 
+若 Runtime 回传 ACP 权限请求，Main 只按活跃 Session 的当前模式答复：Execute 优先选择
+`allow_once`，缺少时使用提供的 `allow_always`，不调用第二次人工 authorizer；
+Ask、已关闭或未知 Session 拒绝。这里不写入永久授权规则，也不把业务问答当作权限确认。
+
 ### 8.5 事件模型
 
 Harness Control Plane 只发送 GoodBuddy 能稳定解释的字段：