refactor: remove deprecated ModelRunner and AgentRunner protocols

ModelRunner and AgentRunner are superseded by the unified Runner protocol
per the AIRUNNER spec. Neither was used in any production SDK logic —
ManagedModel and ManagedAgent already accept Runner directly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jsonbailey

packages/sdk/server-ai/src/ldai/__init__.py

@@ -35,7 +35,6 @@
     AgentGraphResult,
     AgentGraphRunner,
     AgentGraphRunnerResult,
-    AgentRunner,
     GraphMetrics,
     GraphMetricSummary,
     ManagedGraphResult,
@@ -50,7 +49,6 @@
 __all__ = [
     'LDAIClient',
     'Evaluator',
-    'AgentRunner',
     'AgentGraphRunner',
     'AgentGraphResult',
     'AgentGraphRunnerResult',

packages/sdk/server-ai/src/ldai/providers/__init__.py

@@ -1,7 +1,5 @@
 from ldai.providers.agent_graph_runner import AgentGraphRunner
-from ldai.providers.agent_runner import AgentRunner
 from ldai.providers.ai_provider import AIProvider
-from ldai.providers.model_runner import ModelRunner
 from ldai.providers.runner import Runner
 from ldai.providers.runner_factory import RunnerFactory
 from ldai.providers.types import (
@@ -22,14 +20,12 @@
     'AgentGraphResult',
     'AgentGraphRunner',
     'AgentGraphRunnerResult',
-    'AgentRunner',
     'GraphMetrics',
     'GraphMetricSummary',
     'JudgeResult',
     'LDAIMetrics',
     'ManagedGraphResult',
     'ManagedResult',
-    'ModelRunner',
     'Runner',
     'RunnerFactory',
     'RunnerResult',

packages/sdk/server-ai/src/ldai/providers/agent_runner.py

@@ -1,20 +1,11 @@
 import pytest
 
-from ldai.providers import AgentGraphResult, AgentGraphRunner, AgentRunner, ToolRegistry
+from ldai.providers import AgentGraphResult, AgentGraphRunner, ToolRegistry
 from ldai.providers.types import LDAIMetrics, RunnerResult
 
 
 # --- Concrete test doubles ---
 
-class ConcreteAgentRunner:
-    async def run(self, input):
-        return RunnerResult(
-            content=f"agent response to: {input}",
-            metrics=LDAIMetrics(success=True),
-            raw={"raw": input},
-        )
-
-
 class ConcreteAgentGraphRunner:
     async def run(self, input):
         return AgentGraphResult(
@@ -28,26 +19,6 @@ class MissingRunMethod:
     pass
 
 
-# --- AgentRunner ---
-
-def test_agent_runner_structural_check_passes():
-    assert isinstance(ConcreteAgentRunner(), AgentRunner)
-
-
-def test_agent_runner_structural_check_fails_when_run_missing():
-    assert not isinstance(MissingRunMethod(), AgentRunner)
-
-
-@pytest.mark.asyncio
-async def test_agent_runner_run_returns_runner_result():
-    runner = ConcreteAgentRunner()
-    result = await runner.run("hello")
-    assert isinstance(result, RunnerResult)
-    assert result.content == "agent response to: hello"
-    assert result.raw == {"raw": "hello"}
-    assert result.metrics.success is True
-
-
 @pytest.mark.asyncio
 async def test_runner_result_fields():
     metrics = LDAIMetrics(success=True)
@@ -101,7 +72,6 @@ def test_tool_registry_is_dict_of_callables():
 
 def test_top_level_exports():
     import ldai
-    assert hasattr(ldai, 'AgentRunner')
     assert hasattr(ldai, 'AgentGraphRunner')
     assert hasattr(ldai, 'AgentGraphResult')
     assert hasattr(ldai, 'RunnerResult')