fix(mcp): default sub-tasks to skip-permissions and fix idle resolver race

MCP-created sub-tasks now default to skipPermissions=true so Claude Code
spawns with --dangerously-skip-permissions. Without this, a fresh trust
dialog blocks the PromptInput auto-send indefinitely, causing initial
prompts to appear drafted but never execute.

Also fires idle resolvers in the spawn-listener scrollback check so
waitForIdle unblocks correctly when the ❯ prompt was already emitted
before the orchestrator subscribed to output.

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

Author: brooksc

electron/mcp/orchestrator.ts

@@ -167,6 +167,11 @@ export class Orchestrator {
           .trim();
         if (chunkContainsAgentPrompt(stripped)) {
           task.status = 'idle';
+          const resolvers = this.idleResolvers.get(task.id);
+          if (resolvers?.length) {
+            for (const resolve of resolvers) resolve();
+            this.idleResolvers.delete(task.id);
+          }
         }
       }
     });

src/store/tasks.ts

@@ -803,7 +803,7 @@ export function initMCPListeners(): () => void {
         notes: '',
         lastPrompt: '',
         gitIsolation: evt.gitIsolation ?? 'worktree',
-        skipPermissions: evt.skipPermissions ?? false,
+        skipPermissions: evt.skipPermissions ?? true,
         coordinatedBy: evt.coordinatorTaskId,
         // Use the same initialPrompt path as manually created tasks —
         // PromptInput auto-delivers it with stability checks + quiescence.