fix: pass requiresTrigger through IPC and auto-discover additional directories

- IPC register_group handler now passes requiresTrigger field to registerGroup(),
  fixing groups silently defaulting to trigger-required mode
- Agent runner scans /workspace/extra/* and passes them as additionalDirectories
  to the SDK query, so CLAUDE.md files in mounted dirs are loaded automatically

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

src/ipc.ts

@@ -171,6 +171,7 @@ export async function processTaskIpc(
     name?: string;
     folder?: string;
     trigger?: string;
+    requiresTrigger?: boolean;
     containerConfig?: RegisteredGroup['containerConfig'];
   },
   sourceGroup: string, // Verified identity from IPC directory
@@ -366,6 +367,7 @@ export async function processTaskIpc(
           trigger: data.trigger,
           added_at: new Date().toISOString(),
           containerConfig: data.containerConfig,
+          requiresTrigger: data.requiresTrigger,
         });
       } else {
         logger.warn(