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

momentry_runtime/plist/com.momentry.llamacpp.plist

@@ -25,10 +25,10 @@
     </array>
 
     <key>RunAtLoad</key>
-    <true/>
+    <false/>
 
     <key>KeepAlive</key>
-    <true/>
+    <false/>
 
     <key>StandardErrorPath</key>
     <string>/Users/accusys/momentry/log/llamacpp.error.log</string>