feat: expand multi-runtime workflows for 0.10.0

GoodBuddy previously exposed Runtime capabilities, MCP assignments, plugin controls, context compaction, usage reporting, and task-completion behavior through incomplete or inconsistent paths. This release unifies managed OpenCode, Continue, and DeepSeek Harness controls; adds DSH plugin and image workflows; strengthens MCP and Runtime lifecycle bounds; fixes Windows notification activation; validates cross-architecture packages; and presents the approved bilingual four-section release notes.

The DSH plugin marketplace remains a default-off preview whose trusted third-party code runs with current-user permissions. Ask remains read-only, Execute keeps approval controls, and context compaction may use the selected model without deleting GoodBuddy chat history.

Release note: GoodBuddy 0.10.0 重点完善多 Runtime 工作流，统一 OpenCode、Continue 与 DeepSeek Harness 的能力、MCP、插件和上下文管理，并提升长对话、多会话与任务通知的连贯性。

src/main/ipc.ts

@@ -127,6 +127,7 @@ import {
 import {
   agentRuntimeSelectionKey,
   agentRuntimeSelectionSchema,
+  getDefaultRuntimeSelection,
   type AgentRuntimeSelection
 } from '../shared/runtime-selection-contracts'
 import {
@@ -2968,10 +2969,13 @@ export function registerIpcHandlers(
       const conversation = assistantDatabase.getConversation(
         request.conversationId
       )
+      const settings = await settingsStore.getResolvedSettings()
+      const persistedRuntimeSelection =
+        conversation.runtimeSelection ??
+        getDefaultRuntimeSelection(settings)
       if (
         conversation.projectId !== request.projectId ||
-        !conversation.runtimeSelection ||
-        agentRuntimeSelectionKey(conversation.runtimeSelection) !==
+        agentRuntimeSelectionKey(persistedRuntimeSelection) !==
           agentRuntimeSelectionKey(request.runtimeSelection)
       ) {
         throw new Error('对话 Runtime 或 Project 已更改，请刷新后重试')
@@ -2998,7 +3002,6 @@ export function registerIpcHandlers(
         contextCompressionState:
           conversation.contextCompressionState
       }
-      const settings = await settingsStore.getResolvedSettings()
       const selected = applyRuntimeSelection(
         settings,
         request.runtimeSelection