test(deepseek): migrate 6 sites to send_result() (Phase 2.9)

All 6 sites in test_deepseek_provider.py call ai_client.send(...). Each
assertion pattern is slightly different (==, "in", call_args inspection);
migration follows the same pattern: rename to send_result(), add
assert result.ok, and use result.data for the response text.

Changes:
- Rename ai_client.send(...) to ai_client.send_result(...) (6 sites)
- Add assert result.ok (6 sites)
- Replace result == "x" with result.data == "x" (or "x" in result.data)
- Add "from src.result_types import Result" import

7 tests pass (1 unrelated test_deepseek_model_selection + 6 migrated).

tests/test_deepseek_provider.py

@@ -1,6 +1,7 @@
 import unittest.mock
 from unittest.mock import patch, MagicMock
 from src import ai_client
+from src.result_types import Result
 
 def test_deepseek_model_selection() -> None:
  """
@@ -28,14 +29,15 @@ def test_deepseek_completion_logic(mock_post: MagicMock) -> None:
   }
   mock_post.return_value = mock_response
   
-  result = ai_client.send(md_content="Context", user_message="Hi", base_dir=".")
-  assert result == "Hello World"
+  result = ai_client.send_result(md_content="Context", user_message="Hi", base_dir=".")
+  assert result.ok
+  assert result.data == "Hello World"
   assert mock_post.called
 
 @patch("requests.post")
 def test_deepseek_reasoning_logic(mock_post: MagicMock) -> None:
  """
- 
+  
   
       Verifies that reasoning_content is captured and wrapped in <thinking> tags.
  """
@@ -50,10 +52,11 @@ def test_deepseek_reasoning_logic(mock_post: MagicMock) -> None:
    }]
   }
   mock_post.return_value = mock_response
-  
-  result = ai_client.send(md_content="Context", user_message="Hi", base_dir=".")
-  assert "<thinking>\nChain of thought\n</thinking>" in result
-  assert "Final answer" in result
+
+  result = ai_client.send_result(md_content="Context", user_message="Hi", base_dir=".")
+  assert result.ok
+  assert "<thinking>\nChain of thought\n</thinking>" in result.data
+  assert "Final answer" in result.data
 
 @patch("requests.post")
 def test_deepseek_tool_calling(mock_post: MagicMock) -> None:
@@ -93,8 +96,9 @@ def test_deepseek_tool_calling(mock_post: MagicMock) -> None:
   mock_post.side_effect = [mock_resp1, mock_resp2]
   mock_dispatch.return_value = "Hello World"
   
-  result = ai_client.send(md_content="Context", user_message="Read test.txt", base_dir=".")
-  assert "File content is: Hello World" in result
+  result = ai_client.send_result(md_content="Context", user_message="Read test.txt", base_dir=".")
+  assert result.ok
+  assert "File content is: Hello World" in result.data
   assert mock_dispatch.called
   mock_dispatch.assert_called_with("read_file", {"path": "test.txt"})
 
@@ -119,8 +123,9 @@ def test_deepseek_streaming(mock_post: MagicMock) -> None:
   mock_response.iter_lines.return_value = [c.encode('utf-8') for c in chunks]
   mock_post.return_value = mock_response
   
-  result = ai_client.send(md_content="Context", user_message="Stream test", base_dir=".", stream=True)
-  assert result == "Hello World"
+  result = ai_client.send_result(md_content="Context", user_message="Stream test", base_dir=".", stream=True)
+  assert result.ok
+  assert result.data == "Hello World"
 
 @patch("requests.post")
 def test_deepseek_payload_verification(mock_post: MagicMock) -> None:
@@ -139,11 +144,12 @@ def test_deepseek_payload_verification(mock_post: MagicMock) -> None:
   }
   mock_post.return_value = mock_response
   
-  ai_client.send(md_content="Context", user_message="Message 1", base_dir=".", discussion_history="History")
-  
+  result = ai_client.send_result(md_content="Context", user_message="Message 1", base_dir=".", discussion_history="History")
+  assert result.ok
+
   args, kwargs = mock_post.call_args
   payload = kwargs["json"]
-  
+
   assert payload["model"] == "deepseek-chat"
   assert "tools" in payload
   assert len(payload["messages"]) == 2 # system + user
@@ -168,11 +174,12 @@ def test_deepseek_reasoner_payload_verification(mock_post: MagicMock) -> None:
   }
   mock_post.return_value = mock_response
   
-  ai_client.send(md_content="Context", user_message="Message 1", base_dir=".")
-  
+  result = ai_client.send_result(md_content="Context", user_message="Message 1", base_dir=".")
+  assert result.ok
+
   args, kwargs = mock_post.call_args
   payload = kwargs["json"]
-  
+
   assert payload["model"] == "deepseek-reasoner"
   assert "tools" not in payload
   assert "temperature" not in payload