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/asr_benchmark_runner.py

@@ -23,7 +23,7 @@ import signal
 import platform
 import psutil
 from datetime import datetime, timezone
-from typing import Dict, Any, Optional, List, Tuple
+from typing import Dict, Any, List
 from pathlib import Path
 import traceback
 
@@ -606,7 +606,7 @@ class ASRBenchmarkRunner:
                 metrics = result.get('metrics', {})
                 real_time = result.get('real_time', {})
                 
-                lines.append(f"- **Status**: Success")
+                lines.append("- **Status**: Success")
                 lines.append(f"- **Start**: {real_time.get('test_start', 'N/A')}")
                 lines.append(f"- **End**: {real_time.get('test_end', 'N/A')}")
                 lines.append(f"- **Duration**: {metrics.get('processing_time_seconds', 0):.3f}s")
@@ -615,7 +615,7 @@ class ASRBenchmarkRunner:
                 lines.append(f"- **Memory Peak**: {metrics.get('peak_memory_mb', 0):.1f}MB")
                 lines.append(f"- **Language**: {metrics.get('language_detected', 'N/A')} ({metrics.get('language_probability', 0):.2f})")
             else:
-                lines.append(f"- **Status**: Failed")
+                lines.append("- **Status**: Failed")
                 lines.append(f"- **Error**: {result.get('error', 'Unknown error')}")
             
             lines.append("")
@@ -680,7 +680,7 @@ def main():
             runner.generate_results_json()
             runner.generate_markdown_report()
             
-            print(f"\nBenchmark completed!")
+            print("\nBenchmark completed!")
             print(f"Results: {output_dir / 'asr_benchmark_results.json'}")
             print(f"Report: {output_dir / 'asr_benchmark_report.md'}")