Fix accidental namspace package

src/utils/agents was missing an __init__.py, making it a namepsace package. A
side effect of this was it was being skipped by pylint.

Change the namespace package to a package and address pylint failures.

Author: samdoran

src/utils/agents/__init__.py

@@ -0,0 +1 @@
+"""Agent helpers."""

src/utils/agents/streaming.py

@@ -1,5 +1,7 @@
 """Agent streaming helpers for the streaming_query flow."""
 
+# pylint: disable=R0913,R0914, R0917
+
 from __future__ import annotations
 
 import asyncio
@@ -406,7 +408,7 @@ def _process_token(
 def dispatch_stream_event(
     event: AgentDispatchEvent,
     _state: AgentTurnAccumulator,
-) -> Optional[StreamEventPayload]:
+) -> None:
     """Map a pydantic-ai stream event to an SSE payload.
 
     Args:
@@ -417,7 +419,6 @@ def dispatch_stream_event(
         None when the event does not map to an SSE payload.
     """
     logger.debug("Ignoring event kind=%s", event.event_kind)
-    return None
 
 
 @dispatch_stream_event.register

src/utils/agents/tool_processor.py

@@ -101,7 +101,7 @@ def summarize_native_tool_call(
                 type="mcp_call",
             )
         case _:
-            logger.warning(f"Unknown tool name: {part.tool_name}")
+            logger.warning("Unknown tool name: %s", part.tool_name)
             return None
 
 
@@ -184,7 +184,7 @@ def process_native_tool_result(
         case tool_name if tool_name.startswith(_MCP_SERVER_TOOL_PREFIX):
             tool_result = summarize_mcp_tool_result(part, state.tool_round)
         case _:
-            logger.warning(f"Unknown tool name: {part.tool_name}")
+            logger.warning("Unknown tool name: %s", part.tool_name)
             return None
 
     state.emitted_tool_result_ids.add(tool_result.id)