refactor(desktop): split kernel_commands/pipeline_commands into modules, add SaaS client libs and gateway modules

Split monolithic kernel_commands.rs (2185 lines) and pipeline_commands.rs (1391 lines)
into focused sub-modules under kernel_commands/ and pipeline_commands/ directories.
Add gateway module (commands, config, io, runtime), health_check, and 15 new
TypeScript client libraries for SaaS relay, auth, admin, telemetry, and kernel
sub-systems (a2a, agent, chat, hands, skills, triggers).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/lib/saas-telemetry.ts

@@ -0,0 +1,45 @@
+/**
+ * SaaS Telemetry Methods — Mixin
+ *
+ * Installs telemetry reporting methods onto SaaSClient.prototype.
+ * Uses the same mixin pattern as gateway-api.ts.
+ */
+
+export function installTelemetryMethods(ClientClass: { prototype: any }): void {
+  const proto = ClientClass.prototype;
+
+  /** Report anonymous usage telemetry (token counts only, no content) */
+  proto.reportTelemetry = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }, data: {
+    device_id: string;
+    app_version: string;
+    entries: Array<{
+      model_id: string;
+      input_tokens: number;
+      output_tokens: number;
+      latency_ms?: number;
+      success: boolean;
+      error_type?: string;
+      timestamp: string;
+      connection_mode: string;
+    }>;
+  }): Promise<{ accepted: number; rejected: number }> {
+    return this.request<{ accepted: number; rejected: number }>(
+      'POST', '/api/v1/telemetry/report', data,
+    );
+  };
+
+  /** Report audit log summary (action types and counts only, no content) */
+  proto.reportAuditSummary = async function (this: { request<T>(method: string, path: string, body?: unknown): Promise<T> }, data: {
+    device_id: string;
+    entries: Array<{
+      action: string;
+      target: string;
+      result: string;
+      timestamp: string;
+    }>;
+  }): Promise<{ accepted: number; total: number }> {
+    return this.request<{ accepted: number; total: number }>(
+      'POST', '/api/v1/telemetry/audit', data,
+    );
+  };
+}