Strip OPSEC tool identity fingerprints

Replace all sensor.* logger namespaces with __name__ (generic module
identifiers instead of discoverable 'sensor.*' prefixes).

Change hardcoded 'bb' API user to 'admin' in config and code defaults.

Change hardcoded relay_user 'bb' to 'operator' — prevents network
profiling from exposing tool identity via SSH config.

Fixes #457, #458, #459

modules/stealth/anti_forensics.py

@@ -19,7 +19,7 @@ from utils.stealth import (
     _get_os_install_time,
 )
 
-logger = logging.getLogger("sensor.stealth.anti_forensics")
+logger = logging.getLogger(__name__)
 
 # SystemMonitor install root (default; overridden by config)
 BB_ROOT = "/opt/.cache/bb"