Rename Detection Engineer agent key to DetectionEngineer

The agent name is also the agentMapping config key and a SOC setting id
segment, so the space made it awkward to target. Matches the rename in
securityonion-soc.

salt/soc/defaults.yaml

@@ -1532,7 +1532,7 @@ soc:
           agentMapping:
             Orchestrator: Claude Sonnet
             Investigator: Claude Sonnet
-            Detection Engineer: Claude Sonnet
+            DetectionEngineer: Claude Sonnet
         onionconfig:
           saltstackDir: /opt/so/saltstack
           bypassEnabled: false

salt/soc/soc_soc.yaml

@@ -786,7 +786,7 @@ soc:
             Investigator:
               description: This agent investigates alerts, explains events and records, and hunts through event data. It can also acknowledge alerts and escalate to cases.
               global: True
-            Detection Engineer:
+            DetectionEngineer:
               description: This agent manages detections and their overrides, including tuning noisy rules and authoring rule content.
               global: True
       client: