refactor: rename pty_process to cc_runner

The module has long since moved away from PTY technology, using
claude -p with --output-format stream-json and --resume instead.
Rename to cc_runner to accurately reflect what it does.

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

agent/manager.py

@@ -10,7 +10,7 @@ from dataclasses import dataclass, field, asdict
 from pathlib import Path
 from typing import Dict, List, Optional
 
-from agent.pty_process import run_claude, DEFAULT_PERMISSION_MODE, VALID_PERMISSION_MODES
+from agent.cc_runner import run_claude, DEFAULT_PERMISSION_MODE, VALID_PERMISSION_MODES
 from agent.audit import log_interaction
 
 logger = logging.getLogger(__name__)