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/match_face_identity.py

@@ -14,7 +14,6 @@ Usage:
 import json
 import argparse
 import numpy as np
-from datetime import datetime
 import psycopg2
 import os
 
@@ -313,7 +312,7 @@ def analyze_match_results(results):
             print(f"  Is Match: {r['is_match']}")
             
             if r['strategy'] == 'combined':
-                print(f"  Details:")
+                print("  Details:")
                 print(f"    Best Match: {r['best_match']:.4f}")
                 print(f"    Vote Ratio: {r['vote_ratio']:.2%}")
                 print(f"    Weighted Sim: {r['weighted_sim']:.4f}")
@@ -408,7 +407,7 @@ def main():
             print("❌ No embedding in first face")
             return
         
-        print(f"\n🔧 Matching first face...")
+        print("\n🔧 Matching first face...")
         match_result = match_face_to_identity(
             detected_embedding=embedding,
             identity_uuid=identity_uuid,
@@ -419,7 +418,7 @@ def main():
         )
         
         if match_result:
-            print(f"\n✅ Match Result:")
+            print("\n✅ Match Result:")
             print(f"  Identity: {match_result['identity_name']}")
             print(f"  Strategy: {match_result['strategy']}")
             print(f"  Is Match: {match_result['is_match']}")