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>

container/agent-runner/src/index.ts

@@ -371,10 +371,27 @@ async function runQuery(
     globalClaudeMd = fs.readFileSync(globalClaudeMdPath, 'utf-8');
   }
 
+  // Discover additional directories mounted at /workspace/extra/*
+  // These are passed to the SDK so their CLAUDE.md files are loaded automatically
+  const extraDirs: string[] = [];
+  const extraBase = '/workspace/extra';
+  if (fs.existsSync(extraBase)) {
+    for (const entry of fs.readdirSync(extraBase)) {
+      const fullPath = path.join(extraBase, entry);
+      if (fs.statSync(fullPath).isDirectory()) {
+        extraDirs.push(fullPath);
+      }
+    }
+  }
+  if (extraDirs.length > 0) {
+    log(`Additional directories: ${extraDirs.join(', ')}`);
+  }
+
   for await (const message of query({
     prompt: stream,
     options: {
       cwd: '/workspace/group',
+      additionalDirectories: extraDirs.length > 0 ? extraDirs : undefined,
       resume: sessionId,
       resumeSessionAt: resumeAt,
       systemPrompt: globalClaudeMd