fix(setup): isolate scratch agent with hardcoded _ping-test folder

- Scratch agent uses fixed folder `_ping-test` so it can never collide
  with a real agent on re-runs
- Added --folder flag to init-cli-agent.ts and cli-agent step wrapper
- Delete always targets `_ping-test` exactly — no re-derivation needed
- Removed normalizeName coupling and FOLDER status field (no longer needed)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

setup/cli-agent.ts

@@ -8,6 +8,7 @@
  * Args:
  *   --display-name <name>   (required) operator's display name
  *   --agent-name   <name>   (optional) agent persona name, defaults to display-name
+ *   --folder       <name>   (optional) explicit folder name, defaults to cli-with-<normalized-display-name>
  */
 import { execFileSync } from 'child_process';
 import path from 'path';
@@ -18,9 +19,11 @@ import { emitStatus } from './status.js';
 function parseArgs(args: string[]): {
   displayName: string;
   agentName?: string;
+  folder?: string;
 } {
   let displayName: string | undefined;
   let agentName: string | undefined;
+  let folder: string | undefined;
 
   for (let i = 0; i < args.length; i++) {
     const key = args[i];
@@ -34,6 +37,10 @@ function parseArgs(args: string[]): {
         agentName = val;
         i++;
         break;
+      case '--folder':
+        folder = val;
+        i++;
+        break;
     }
   }
 
@@ -46,23 +53,23 @@ function parseArgs(args: string[]): {
     process.exit(2);
   }
 
-  return { displayName, agentName };
+  return { displayName, agentName, folder };
 }
 
 export async function run(args: string[]): Promise<void> {
-  const { displayName, agentName } = parseArgs(args);
+  const { displayName, agentName, folder } = parseArgs(args);
 
   const projectRoot = process.cwd();
   const script = path.join(projectRoot, 'scripts', 'init-cli-agent.ts');
 
   const scriptArgs = ['exec', 'tsx', script, '--display-name', displayName];
   if (agentName) scriptArgs.push('--agent-name', agentName);
+  if (folder) scriptArgs.push('--folder', folder);
 
   log.info('Invoking init-cli-agent', { displayName, agentName });
 
-  let stdout = '';
   try {
-    stdout = execFileSync('pnpm', scriptArgs, {
+    execFileSync('pnpm', scriptArgs, {
       cwd: projectRoot,
       stdio: ['ignore', 'pipe', 'pipe'],
       encoding: 'utf-8',
@@ -83,11 +90,9 @@ export async function run(args: string[]): Promise<void> {
     process.exit(1);
   }
 
-  const folderMatch = stdout.match(/@ groups\/(\S+)/);
   emitStatus('CLI_AGENT', {
     DISPLAY_NAME: displayName,
     AGENT_NAME: agentName || displayName,
-    FOLDER: folderMatch?.[1] ?? '',
     CHANNEL: 'cli/local',
     STATUS: 'success',
     LOG: 'logs/setup.log',