feat: expand secure assistant workflows

Harden runtime execution and add local knowledge, Smart Heartbeat, usage visibility, responsive product surfaces, and cross-platform packaging support.

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

src/main/agent/unconfigured-runtime.ts

@@ -9,12 +9,14 @@ import type {
 
 export class UnconfiguredAgentRuntime implements AgentRuntime {
   readonly requiresToolApproval = false
+  readonly supportsToolExecution = false
 
   getStatus(): Promise<AgentRuntimeStatus> {
     return Promise.resolve({
       id: 'setup',
       label: '需要配置模型',
       available: false,
+      supportsToolExecution: this.supportsToolExecution,
       detail: '请在设置中选择并配置可用的模型或 Agent Runtime'
     })
   }
@@ -25,6 +27,7 @@ export class UnconfiguredAgentRuntime implements AgentRuntime {
     yield {
       requestId: request.requestId,
       type: 'error',
+      status: 'failed',
       message: '请先完成模型与 Agent Runtime 配置'
     }
   }