Remove superseded configuration loaders and consolidate runtime tests

prepared_observation_contract_test.go

@@ -6,8 +6,8 @@ import (
 	"sync"
 	"testing"
 
+	"gitea.maximumdirect.net/eric/ConfigKit"
 	"gitea.maximumdirect.net/eric/promptkit"
-	"gitea.maximumdirect.net/eric/promptkit/testfixture"
 )
 
 func TestPreparedObservationStartsOnlyAfterClaimAndKeepsObserver(t *testing.T) {
@@ -132,10 +132,18 @@ func TestPreparedObservationClaimRaceAndPanicCleanup(t *testing.T) {
 func TestPreparedObservationFinishesAfterCredentialAndCapacityFailures(t *testing.T) {
 	const envName = "PROMPTKIT_PREPARED_OBSERVATION_KEY"
 	t.Setenv(envName, "available")
-	engine, err := testfixture.NewEngine(testfixture.Config{},
-		testfixture.WithPromptFS(contractPromptFS("prepared", "profile", "hello"), "."),
-		testfixture.WithProfiles(testfixture.Profile{ID: "profile", Endpoint: "https://example.invalid/v1", Model: "model", APIKeyRequired: true}),
-		promptkit.WithLLMClient(&fakeLLMClient{response: &promptkit.GenerateResponse{Content: "ok"}}))
+	engine, err := promptkit.NewEngine(promptkit.Config{Sources: promptkit.ConfigurationSources{Main: &configkit.Input{
+		Source: configkit.Mapping("credential preparation", map[string]any{
+			"profiles": map[string]any{"profile": map[string]any{
+				"endpoint": "https://example.invalid/v1", "model": "model", "api_key_required": true,
+			}},
+			"prompts": map[string]any{"prepared": map[string]any{"1": map[string]any{
+				"default_profile": "profile",
+				"messages":        []any{map[string]any{"role": "user", "content": "hello"}},
+				"output":          map[string]any{"format": "text", "validation_mode": "none"},
+			}}},
+		}),
+	}}}, promptkit.WithLLMClient(&fakeLLMClient{response: &promptkit.GenerateResponse{Content: "ok"}}))
 	if err != nil {
 		t.Fatal(err)
 	}