Add unified explainability support and librarian storage for (#693)

Add unified explainability support and librarian storage for all retrieval engines

Implements consistent explainability/provenance tracking
across GraphRAG, DocumentRAG, and Agent retrieval
engines. All large content (answers, thoughts, observations)
is now stored in librarian rather than as inline literals in
the knowledge graph.

Explainability API:
- New explainability.py module with entity classes (Question,
  Exploration, Focus, Synthesis, Analysis, Conclusion) and
  ExplainabilityClient
- Quiescence-based eventual consistency handling for trace
  fetching
- Content fetching from librarian with retry logic

CLI updates:
- tg-invoke-graph-rag -x/--explainable flag returns
  explain_id
- tg-invoke-document-rag -x/--explainable flag returns
  explain_id
- tg-invoke-agent -x/--explainable flag returns explain_id
- tg-list-explain-traces uses new explainability API
- tg-show-explain-trace handles all three trace types

Agent provenance:
- Records session, iterations (think/act/observe), and conclusion
- Stores thoughts and observations in librarian with document
  references
- New predicates: tg:thoughtDocument, tg:observationDocument

DocumentRAG provenance:
- Records question, exploration (chunk retrieval), and synthesis
- Stores answers in librarian with document references

Schema changes:
- AgentResponse: added explain_id, explain_graph fields
- RetrievalResponse: added explain_id, explain_graph fields
- agent_iteration_triples: supports thought_document_id,
  observation_document_id

Update tests.

trustgraph-base/trustgraph/schema/services/agent.py

@@ -30,11 +30,15 @@ class AgentRequest:
 @dataclass
 class AgentResponse:
     # Streaming-first design
-    chunk_type: str = ""        # "thought", "action", "observation", "answer", "error"
+    chunk_type: str = ""        # "thought", "action", "observation", "answer", "explain", "error"
     content: str = ""           # The actual content (interpretation depends on chunk_type)
     end_of_message: bool = False   # Current chunk type (thought/action/etc.) is complete
     end_of_dialog: bool = False    # Entire agent dialog is complete
 
+    # Explainability fields
+    explain_id: str | None = None     # Provenance URI (announced as created)
+    explain_graph: str | None = None  # Named graph where explain was stored
+
     # Legacy fields (deprecated but kept for backward compatibility)
     answer: str = ""
     error: Error | None = None

trustgraph-base/trustgraph/schema/services/retrieval.py

@@ -43,6 +43,8 @@ class DocumentRagQuery:
 class DocumentRagResponse:
     error: Error | None = None
     response: str | None = ""
-    end_of_stream: bool = False
+    end_of_stream: bool = False       # LLM response stream complete
     explain_id: str | None = None     # Single explain URI (announced as created)
     explain_graph: str | None = None  # Named graph where explain was stored (e.g., urn:graph:retrieval)
+    message_type: str = ""            # "chunk" or "explain"
+    end_of_session: bool = False      # Entire session complete