fix: remove deprecated pydantic-ai attribute reference

Removes reference to `_deprecated_result_tool_name` which was removed
in pydantic-ai 0.6.0. Updates minimum pydantic-ai version to 0.6.0.

Fixes #1184

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: zzstoatzz

pyproject.toml

@@ -10,7 +10,7 @@ dependencies = [
     "alembic>=1.12.0",
     "jinja2>=3.1.4",
     "partial-json-parser>=0.2.1.1.post5",
-    "pydantic-ai>=0.3.3",
+    "pydantic-ai>=0.6.0",
     "pydantic-settings>=2.6.1",
     "pydantic[email]>=2.10.6",
     "rich>=13.9.4",

src/marvin/engine/streaming.py

@@ -87,7 +87,6 @@ async def handle_agentlet_events(
     end_turn_tools_map = {}
     for t in agentlet._marvin_end_turn_tools:
         end_turn_tools_map[t.__name__] = t
-        end_turn_tools_map[f"{agentlet._deprecated_result_tool_name}_{t.__name__}"] = t
 
     async for node in run:
         if pydantic_ai.Agent.is_user_prompt_node(node):