fix: stabilize Runtime workflows for 0.12.3

OpenCode status checks could cold-start throwaway servers, unrelated
conversations could block each other, and model, Continue, or remote paths
could replay or duplicate work under failure and backlog conditions. Settings
could also lose edits or overwrite unrelated model fields.

This update makes status checks passive, keeps per-conversation ordering while
allowing concurrency, preserves native long-running work with bounded display
capture and backpressure, narrows retries to known pre-dispatch failures, and
aligns remote Ask permissions without reducing Execute. It also keeps
Embedding updates narrow, improves settings and browser guidance, removes the
unused legacy Main gateway state, and records the validated Desktop 0.12.3 and
Agent 0.11.17 release metadata.

Release note: 改善 OpenCode 切换、多会话长任务、模型重试、远程 Ask/Execute 与设置保存可靠性，并完成 Desktop 0.12.3 / Agent 0.11.17 发布准备。

src/main/agent/opencode-runtime.ts

@@ -477,6 +477,11 @@ export type OpenCodeRuntimeDependencies = {
     configuredPath: string,
     bundledPath?: string
   ) => Promise<{ path?: string; detail: string }>
+  validateBinary: (
+    runtime: 'opencode',
+    configuredPath: string,
+    bundledPath?: string
+  ) => Promise<{ path?: string; detail: string }>
   createClient: typeof createOpencodeClient
   checkServerHealth: (
     url: string,
@@ -695,6 +700,19 @@ async function defaultDetectBinary(
   })
 }
 
+async function defaultValidateBinary(
+  runtime: 'opencode',
+  configuredPath: string
+): Promise<{ path?: string; detail: string }> {
+  return detectRuntimeBinary({
+    binaryPath: configuredPath,
+    validation: 'canonical-file',
+    allowAutomaticDiscovery: false,
+    binaryNames: [runtime],
+    label: 'OpenCode CLI'
+  })
+}
+
 async function defaultCheckServerHealth(
   url: string,
   authorization: string,
@@ -740,6 +758,7 @@ export class OpenCodeRuntime implements AgentRuntime {
     this.dependencies = {
       spawn,
       detectBinary: defaultDetectBinary,
+      validateBinary: defaultValidateBinary,
       createClient: createOpencodeClient,
       checkServerHealth: defaultCheckServerHealth,
       platform: process.platform,
@@ -854,15 +873,37 @@ export class OpenCodeRuntime implements AgentRuntime {
     }
   }
 
-  private async launchEmbedded(signal?: AbortSignal): Promise<OpenCodeServer> {
-    if (signal?.aborted) {
-      throw new Error('OpenCode Server 启动已取消')
+  private async inspectEmbeddedConfiguration(
+    validatePath = false
+  ): Promise<{
+    path?: string
+    detail: string
+  }> {
+    if (
+      this.options.modelProfile?.authentication === 'api-key' &&
+      !this.options.modelProfile.apiKey
+    ) {
+      throw new Error('OpenCode 独立模型连接尚未配置 API Key')
     }
     const detection = await this.dependencies.detectBinary(
       'opencode',
       this.options.binaryPath,
       this.options.bundledBinaryPath
     )
+    if (!validatePath || !detection.path) {
+      return detection
+    }
+    return this.dependencies.validateBinary(
+      'opencode',
+      detection.path
+    )
+  }
+
+  private async launchEmbedded(signal?: AbortSignal): Promise<OpenCodeServer> {
+    if (signal?.aborted) {
+      throw new Error('OpenCode Server 启动已取消')
+    }
+    const detection = await this.inspectEmbeddedConfiguration()
     const binaryPath = detection.path
     if (!binaryPath) {
       throw new Error(detection.detail)
@@ -875,12 +916,6 @@ export class OpenCodeRuntime implements AgentRuntime {
       throw new Error('OpenCode Server 启动已取消')
     }
 
-    if (
-      this.options.modelProfile?.authentication === 'api-key' &&
-      !this.options.modelProfile.apiKey
-    ) {
-      throw new Error('OpenCode 独立模型连接尚未配置 API Key')
-    }
     const skillIds = this.getNativeSkillIds()
     const registration = await this.createSkillRegistration()
     try {
@@ -1186,6 +1221,38 @@ export class OpenCodeRuntime implements AgentRuntime {
   }
 
   async getStatus(): Promise<AgentRuntimeStatus> {
+    if (this.usesEmbeddedPermissionMediation() && !this.client) {
+      try {
+        const detection =
+          await this.inspectEmbeddedConfiguration(true)
+        return {
+          id: 'opencode',
+          label: 'OpenCode',
+          available: Boolean(detection.path),
+          supportsToolExecution: this.supportsToolExecution,
+          detail: detection.path
+            ? 'OpenCode 已配置，将在首次使用时启动'
+            : detection.detail
+        }
+      } catch (error) {
+        return {
+          id: 'opencode',
+          label: 'OpenCode',
+          available: false,
+          supportsToolExecution: this.supportsToolExecution,
+          detail:
+            error instanceof Error ? error.message : 'OpenCode 不可用'
+        }
+      }
+    }
+    return this.checkConnection()
+  }
+
+  async testConnection(): Promise<AgentRuntimeStatus> {
+    return this.checkConnection()
+  }
+
+  private async checkConnection(): Promise<AgentRuntimeStatus> {
     try {
       const client = await this.getClient()
       const response = await this.controlRequest(