feat(cli): migrate console calls to debugLogger and stdioHelpers (M3 Phase 7-9)

Route CLI console.* calls to structured logging:
- Debug/internal diagnostics → debugLogger (logfile)
- User-facing output → writeStdoutLine/writeStderrLine/clearScreen (stdioHelpers)
- Add stdioHelpers.ts with writeStdoutLine, writeStderrLine, clearScreen
- Migrate pre-session files (gemini.tsx, sandbox.ts, config.ts) to stdioHelpers
- Migrate extension/MCP commands to stdioHelpers
- Migrate non-interactive session/control to debugLogger
- Migrate UI hooks and components to debugLogger

packages/cli/src/nonInteractiveCliCommands.ts

@@ -10,6 +10,7 @@ import {
   Logger,
   uiTelemetryService,
   type Config,
+  createDebugLogger,
 } from '@qwen-code/qwen-code-core';
 import { CommandService } from './services/CommandService.js';
 import { BuiltinCommandLoader } from './services/BuiltinCommandLoader.js';
@@ -25,6 +26,8 @@ import type { LoadedSettings } from './config/settings.js';
 import type { SessionStatsState } from './ui/contexts/SessionContext.js';
 import { t } from './i18n/index.js';
 
+const debugLogger = createDebugLogger('NON_INTERACTIVE_COMMANDS');
+
 /**
  * Built-in commands that are allowed in non-interactive modes (CLI and ACP).
  * Only safe, read-only commands that don't require interactive UI.
@@ -377,7 +380,7 @@ export const getAvailableCommands = async (
     return filteredCommands.filter((cmd) => !cmd.hidden);
   } catch (error) {
     // Handle errors gracefully - log and return empty array
-    console.error('Error loading available commands:', error);
+    debugLogger.error('Error loading available commands:', error);
     return [];
   }
 };