Minor agent-orchestrator updates (#746)

Tidy agent-orchestrator logs

Added CLI support for selecting the pattern...

  tg-invoke-agent -q "What is the document about?" -p supervisor -v
  tg-invoke-agent -q "What is the document about?" -p plan-then-execute -v
  tg-invoke-agent -q "What is the document about?" -p react -v

Added new event types to tg-show-explain-trace

trustgraph-base/trustgraph/api/explainability.py

@@ -999,8 +999,6 @@ class ExplainabilityClient:
         trace = {
             "question": None,
             "steps": [],
-            "iterations": [],  # Backwards compatibility for ReAct
-            "conclusion": None,
         }
 
         # Fetch question/session
@@ -1015,11 +1013,6 @@ class ExplainabilityClient:
             is_first=True, max_depth=50,
         )
 
-        # Backwards compat: populate iterations from steps
-        trace["iterations"] = [
-            s for s in trace["steps"] if isinstance(s, Analysis)
-        ]
-
         return trace
 
     def _follow_provenance_chain(
@@ -1081,7 +1074,6 @@ class ExplainabilityClient:
 
             elif isinstance(entity, (Conclusion, Synthesis)):
                 trace["steps"].append(entity)
-                trace["conclusion"] = entity
 
     def list_sessions(
         self,