Apply ConfigKit operational configuration defaults

internal/core/config/load.go

@@ -29,14 +29,9 @@ func loadDocumentSource(source configkit.Source, options LoadOptions) (*configki
 
 func documentDefinition() configkit.Definition[Document] {
 	return configkit.Definition[Document]{
-		Defaults: func() Document {
-			return Document{
-				Pipelines: map[string]PipelineDocument{},
-				Concurrency: &ConcurrencyDocument{
-					StageWorkers: map[string]int{},
-				},
-			}
-		},
+		Defaults: documentDefaults,
+		Resolve:  resolveDocumentOperations,
+		Validate: validateDocumentOperations,
 		Version: &configkit.VersionRule{
 			Path:  configkit.Keys("version"),
 			Check: validateDocumentVersion,
@@ -44,6 +39,30 @@ func documentDefinition() configkit.Definition[Document] {
 	}
 }
 
+func documentDefaults() Document {
+	return Document{
+		Pipelines: map[string]PipelineDocument{},
+		Concurrency: &ConcurrencyDocument{
+			TotalLLM:     documentValue(defaultLLMConcurrency),
+			StageWorkers: map[string]int{},
+		},
+		Output: &OutputDocument{Directory: documentValue("./notarius-output")},
+		Cache: &CacheDocument{
+			ChunkPlans: &ChunkPlanCacheDocument{
+				Directory: documentValue(""),
+				Mode:      documentValue("auto"),
+			},
+			Checkpoints: &CheckpointCacheDocument{
+				Enabled:   documentValue(false),
+				Directory: documentValue(""),
+			},
+		},
+		Debug: &DebugDocument{Directory: documentValue("./notarius-debug")},
+	}
+}
+
+func documentValue[T any](value T) *T { return &value }
+
 func validateDocumentVersion(version configkit.Version, validation *configkit.Validation) error {
 	if !version.Present || version.Null {
 		validation.Error(configkit.Keys("version"), "configuration version is required")