cleanup: remove dead code and duplicate docs

- Remove session-ses_2f27.md (161KB raw session log)
- Remove 49 ROOT_* duplicate files across REFERENCE/
- Remove 14 duplicate files between REFERENCE/ root and history/
- Remove asr_legacy.rs (dead code, replaced by asr.rs)
- Remove src/core/worker/ (duplicate JobWorker)
- Remove src/core/layers/ (empty directory)
- Remove 4 .bak files in src/
- Remove 7 dead private methods in worker/processor.rs
- Remove backup directory from git tracking

scripts/check_architecture_docs.py

@@ -12,14 +12,13 @@
 python3 scripts/check_architecture_docs.py [--report] [--verbose]
 """
 
-import os
 import re
 import sys
 import glob
 import json
 import argparse
 from pathlib import Path
-from typing import Dict, List, Set, Tuple, Optional
+from typing import Dict, List, Set, Optional
 from collections import defaultdict
 
 # 配置
@@ -410,15 +409,15 @@ class ArchitectureDocChecker:
             print(f"{'=' * 60}")
             print(f"📁 檢查文件數: {total_files}")
             print(f"⚠️  發現問題數: {total_issues}")
-            print(f"\n問題分類:")
+            print("\n問題分類:")
             for issue_type, count in report["summary"]["issues_by_type"].items():
                 print(f"  - {issue_type}: {count}")
-            print(f"\n嚴重程度:")
+            print("\n嚴重程度:")
             for severity, count in report["summary"]["issues_by_severity"].items():
                 print(f"  - {severity}: {count}")
 
             if total_issues > 0:
-                print(f"\n🔍 詳細問題:")
+                print("\n🔍 詳細問題:")
                 for file_report in report["files"]:
                     if file_report["issues"]:
                         print(f"\n文件: {file_report['file']}")
@@ -474,7 +473,7 @@ def main():
             print(f"\n❌ 發現 {report['summary']['total_issues']} 個問題，請修復")
             sys.exit(1)
         else:
-            print(f"\n✅ 所有檢查通過！")
+            print("\n✅ 所有檢查通過！")
             sys.exit(0)