Drop obsolete LLM request sanitization test

The client no longer strips sampling parameters per model, so the
sanitization test and its capturing provider helper assert behavior
that was intentionally removed. Delete them to restore a green build.

Signed-off-by: Émile Ré <emile@probo.com>

pkg/llm/llm_test.go

@@ -47,24 +47,6 @@ func (m *mockProvider) ChatCompletionStream(_ context.Context, _ *llm.ChatComple
 	return m.streamResp, m.streamErr
 }
 
-// capturingProvider records the request it received so tests can assert
-// on the parameters the client forwarded to the provider.
-type capturingProvider struct {
-	lastReq    *llm.ChatCompletionRequest
-	chatResp   *llm.ChatCompletionResponse
-	streamResp llm.ChatCompletionStream
-}
-
-func (p *capturingProvider) ChatCompletion(_ context.Context, req *llm.ChatCompletionRequest) (*llm.ChatCompletionResponse, error) {
-	p.lastReq = req
-	return p.chatResp, nil
-}
-
-func (p *capturingProvider) ChatCompletionStream(_ context.Context, req *llm.ChatCompletionRequest) (llm.ChatCompletionStream, error) {
-	p.lastReq = req
-	return p.streamResp, nil
-}
-
 type mockStream struct {
 	events   []llm.ChatCompletionStreamEvent
 	idx      int
@@ -376,105 +358,6 @@ func TestChatCompletion(t *testing.T) {
 	})
 }
 
-// ---------------------------------------------------------------------------
-// Client — request sanitization
-// ---------------------------------------------------------------------------
-
-func TestChatCompletionSanitizesUnsupportedParameters(t *testing.T) {
-	t.Parallel()
-
-	temp := 0.1
-	topP := 0.9
-	freq := 0.5
-	pres := 0.5
-
-	t.Run("drops temperature for reasoning model snapshot", func(t *testing.T) {
-		t.Parallel()
-
-		provider := &capturingProvider{
-			chatResp: &llm.ChatCompletionResponse{
-				Model:        "gpt-5-nano",
-				FinishReason: llm.FinishReasonStop,
-				Message: llm.Message{
-					Role:  llm.RoleAssistant,
-					Parts: []llm.Part{llm.TextPart{Text: "ok"}},
-				},
-			},
-		}
-
-		client, _ := newTestClient(provider)
-		_, err := client.ChatCompletion(context.Background(), &llm.ChatCompletionRequest{
-			Model:            "gpt-5-nano-2025-08-07",
-			Messages:         []llm.Message{{Role: llm.RoleUser, Parts: []llm.Part{llm.TextPart{Text: "Hi"}}}},
-			Temperature:      &temp,
-			TopP:             &topP,
-			FrequencyPenalty: &freq,
-			PresencePenalty:  &pres,
-		})
-
-		require.NoError(t, err)
-		require.NotNil(t, provider.lastReq)
-		assert.Nil(t, provider.lastReq.Temperature)
-		assert.Nil(t, provider.lastReq.TopP)
-		assert.Nil(t, provider.lastReq.FrequencyPenalty)
-		assert.Nil(t, provider.lastReq.PresencePenalty)
-	})
-
-	t.Run("keeps temperature for chat model", func(t *testing.T) {
-		t.Parallel()
-
-		provider := &capturingProvider{
-			chatResp: &llm.ChatCompletionResponse{
-				Model:        "gpt-4o",
-				FinishReason: llm.FinishReasonStop,
-				Message: llm.Message{
-					Role:  llm.RoleAssistant,
-					Parts: []llm.Part{llm.TextPart{Text: "ok"}},
-				},
-			},
-		}
-
-		client, _ := newTestClient(provider)
-		_, err := client.ChatCompletion(context.Background(), &llm.ChatCompletionRequest{
-			Model:       "gpt-4o",
-			Messages:    []llm.Message{{Role: llm.RoleUser, Parts: []llm.Part{llm.TextPart{Text: "Hi"}}}},
-			Temperature: &temp,
-		})
-
-		require.NoError(t, err)
-		require.NotNil(t, provider.lastReq)
-		require.NotNil(t, provider.lastReq.Temperature)
-		assert.InEpsilon(t, 0.1, *provider.lastReq.Temperature, 1e-9)
-	})
-
-	t.Run("leaves unknown model untouched", func(t *testing.T) {
-		t.Parallel()
-
-		provider := &capturingProvider{
-			chatResp: &llm.ChatCompletionResponse{
-				Model:        "mystery-model",
-				FinishReason: llm.FinishReasonStop,
-				Message: llm.Message{
-					Role:  llm.RoleAssistant,
-					Parts: []llm.Part{llm.TextPart{Text: "ok"}},
-				},
-			},
-		}
-
-		client, _ := newTestClient(provider)
-		_, err := client.ChatCompletion(context.Background(), &llm.ChatCompletionRequest{
-			Model:       "mystery-model",
-			Messages:    []llm.Message{{Role: llm.RoleUser, Parts: []llm.Part{llm.TextPart{Text: "Hi"}}}},
-			Temperature: &temp,
-		})
-
-		require.NoError(t, err)
-		require.NotNil(t, provider.lastReq)
-		require.NotNil(t, provider.lastReq.Temperature)
-		assert.InEpsilon(t, 0.1, *provider.lastReq.Temperature, 1e-9)
-	})
-}
-
 // ---------------------------------------------------------------------------
 // Client — ChatCompletionStream
 // ---------------------------------------------------------------------------