feat: centralize telemetry logging at LLM client level (#8815)

* feat: centralize telemetry logging at LLM client level

Moves telemetry logging from individual adapters to LLMClientBase:
- Add TelemetryStreamWrapper for streaming telemetry on stream close
- Add request_async_with_telemetry() for non-streaming requests
- Add stream_async_with_telemetry() for streaming requests
- Add set_telemetry_context() to configure agent_id, run_id, step_id

Updates adapters and agents to use new pattern:
- LettaLLMAdapter now accepts agent_id/run_id in constructor
- Adapters call set_telemetry_context() before LLM requests
- Removes duplicate telemetry logging from adapters
- Enriches traces with agent_id, run_id, call_type metadata

🐙 Generated with [Letta Code](https://letta.com)

Co-Authored-By: Letta <noreply@letta.com>

* fix: accumulate streaming response content for telemetry

TelemetryStreamWrapper now extracts actual response data from chunks:
- Content text (concatenated from deltas)
- Tool calls (id, name, arguments)
- Model name, finish reason, usage stats

🐙 Generated with [Letta Code](https://letta.com)

Co-Authored-By: Letta <noreply@letta.com>

* refactor: move streaming telemetry to caller (option 3)

- Remove TelemetryStreamWrapper class
- Add log_provider_trace_async() helper to LLMClientBase
- stream_async_with_telemetry() now just returns raw stream
- Callers log telemetry after processing with rich interface data

Updated callers:
- summarizer.py: logs content + usage after stream processing
- letta_agent.py: logs tool_call, reasoning, model, usage

🐙 Generated with [Letta Code](https://letta.com)

Co-Authored-By: Letta <noreply@letta.com>

* fix: pass agent_id and run_id to parent adapter class

LettaLLMStreamAdapter was not passing agent_id/run_id to parent,
causing "unexpected keyword argument" errors.

🐙 Generated with [Letta Code](https://letta.com)

Co-Authored-By: Letta <noreply@letta.com>

---------

Co-authored-by: Letta <noreply@letta.com>

letta/agents/letta_agent_v3.py

@@ -167,7 +167,9 @@ class LettaAgentV3(LettaAgentV2):
                 messages=list(self.in_context_messages + input_messages_to_persist),
                 input_messages_to_persist=input_messages_to_persist,
                 # TODO need to support non-streaming adapter too
-                llm_adapter=SimpleLLMRequestAdapter(llm_client=self.llm_client, llm_config=self.agent_state.llm_config),
+                llm_adapter=SimpleLLMRequestAdapter(
+                    llm_client=self.llm_client, llm_config=self.agent_state.llm_config, agent_id=self.agent_state.id, run_id=run_id
+                ),
                 run_id=run_id,
                 # use_assistant_message=use_assistant_message,
                 include_return_message_types=include_return_message_types,
@@ -307,12 +309,15 @@ class LettaAgentV3(LettaAgentV2):
             llm_adapter = SimpleLLMStreamAdapter(
                 llm_client=self.llm_client,
                 llm_config=self.agent_state.llm_config,
+                agent_id=self.agent_state.id,
                 run_id=run_id,
             )
         else:
             llm_adapter = SimpleLLMRequestAdapter(
                 llm_client=self.llm_client,
                 llm_config=self.agent_state.llm_config,
+                agent_id=self.agent_state.id,
+                run_id=run_id,
             )
 
         try: