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/pose_processor.py

@@ -17,10 +17,8 @@ import json
 import argparse
 import os
 import time
-from datetime import datetime
 
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
-from redis_publisher import RedisPublisher
 from resume_framework import ResumeFramework, format_time, print_progress