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/clip_logo_integration.py

@@ -256,7 +256,7 @@ def test_similarity_search(
         result = cur.fetchone()
         
         if not result or not result[0]:
-            print(f"⚠️ Identity embedding not found")
+            print("⚠️ Identity embedding not found")
             return []
         
         stored_embedding_raw = result[0]
@@ -323,7 +323,7 @@ def main():
     logo_path = TEMP_DIR / f"{name.replace(' ', '_')}.png"
     
     if not logo_path.exists():
-        print(f"\n🔧 Downloading logo...")
+        print("\n🔧 Downloading logo...")
         if not download_image(logo_url, logo_path):
             sys.exit(1)
     
@@ -334,18 +334,18 @@ def main():
     if args.performance:
         perf_result = test_mps_performance(model, processor, device, logo_path, iterations=10)
         if perf_result:
-            print(f"\n📊 Performance Summary:")
+            print("\n📊 Performance Summary:")
             print(f"  MPS: {perf_result['mps_time']:.4f}s/img")
             print(f"  CPU: {perf_result['cpu_time']:.4f}s/img")
             print(f"  Speedup: {perf_result['speedup']:.2f}x")
     
-    print(f"\n🔧 Extracting CLIP embedding...")
+    print("\n🔧 Extracting CLIP embedding...")
     embedding = extract_clip_embedding(model, processor, device, logo_path)
     
     if not embedding:
         sys.exit(1)
     
-    print(f"\n🔧 Registering to database...")
+    print("\n🔧 Registering to database...")
     uuid = register_logo_identity_to_db(
         name=name,
         logo_url=logo_url,
@@ -354,13 +354,13 @@ def main():
     )
     
     if uuid:
-        print(f"\n🎉 Integration completed!")
+        print("\n🎉 Integration completed!")
         print(f"   Identity: {name}")
         print(f"   UUID: {uuid}")
         print(f"   Embedding: {len(embedding)}-dim")
         print(f"   URL: {logo_url}")
         
-        print(f"\n🔧 Testing similarity search...")
+        print("\n🔧 Testing similarity search...")
         test_embeddings = [
             embedding,
             [0.1] * 768,
@@ -369,9 +369,9 @@ def main():
         matches = test_similarity_search(uuid, test_embeddings, threshold=0.85, schema=args.schema)
         
         if matches:
-            print(f"\n✅ Similarity search test passed")
+            print("\n✅ Similarity search test passed")
     else:
-        print(f"\n❌ Integration failed")
+        print("\n❌ Integration failed")
         sys.exit(1)