Simplify downstream tool configuration

internal/config/load.go

@@ -244,6 +244,9 @@ func applySeriatimDefaults(cfg *SeriatimConfig) {
 	if cfg == nil {
 		return
 	}
+	if cfg.Binary == "" {
+		cfg.Binary = "seriatim"
+	}
 	if cfg.Timeout == "" {
 		cfg.Timeout = "10m"
 	}
@@ -262,15 +265,12 @@ func applyAuditaDefaults(cfg *AuditaConfig) {
 	if cfg == nil {
 		return
 	}
+	if cfg.Binary == "" {
+		cfg.Binary = "audita"
+	}
 	if cfg.Timeout == "" {
 		cfg.Timeout = "3h"
 	}
-	if cfg.BaseURL == "" {
-		cfg.BaseURL = "https://openrouter.ai/api/v1"
-	}
-	if cfg.Model == "" {
-		cfg.Model = "openrouter/google/gemma-4-31b-it"
-	}
 	if cfg.Report == nil {
 		cfg.Report = boolPtr(true)
 	}
@@ -280,6 +280,9 @@ func applyScriptoriumDefaults(cfg *ScriptoriumConfig) {
 	if cfg == nil {
 		return
 	}
+	if cfg.Binary == "" {
+		cfg.Binary = "scriptorium"
+	}
 	if cfg.Timeout == "" {
 		cfg.Timeout = "10m"
 	}

internal/config/load_validate_test.go

@@ -37,6 +37,26 @@ inputs:
   speakers_file: ./speakers.yml
   autocorrect_file: ./autocorrect.yml
   glossary_file: ./glossary.yml
+`,
+			checkDefault: true,
+		},
+		{
+			name: "seriatim and audita sections can be omitted",
+			pipelineYAML: `workspace:
+  root: /tmp/narratio
+whisperx:
+  transcribe_url: https://transcription.ai.rakestrawhome.com/transcribe
+analyzer:
+  timeout: 20m
+notification:
+  timeout: 15s
+`,
+			sessionYAML: `session_id: 2026-05-03
+inputs:
+  audio_dir: ./audio
+  speakers_file: ./speakers.yml
+  autocorrect_file: ./autocorrect.yml
+  glossary_file: ./glossary.yml
 `,
 			checkDefault: true,
 		},
@@ -296,7 +316,7 @@ inputs:
 			wantLoadErr: "strict decode failed",
 		},
 		{
-			name: "missing seriatim binary fails",
+			name: "missing seriatim binary uses default",
 			pipelineYAML: `workspace:
   root: /tmp/narratio
 whisperx:
@@ -311,7 +331,6 @@ inputs:
   autocorrect_file: ./autocorrect.yml
   glossary_file: ./glossary.yml
 `,
-			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.seriatim.binary is required",
 		},
 		{
 			name: "invalid seriatim timeout fails",
@@ -412,7 +431,7 @@ inputs:
 			wantLoadErr: "strict decode failed",
 		},
 		{
-			name: "missing audita binary fails",
+			name: "missing audita binary uses default",
 			pipelineYAML: `workspace:
   root: /tmp/narratio
 whisperx:
@@ -429,7 +448,6 @@ inputs:
   autocorrect_file: ./autocorrect.yml
   glossary_file: ./glossary.yml
 `,
-			wantValidate: "pipeline config \"pipeline.yml\" invalid: pipeline.audita.binary is required",
 		},
 		{
 			name: "invalid audita timeout fails",
@@ -713,6 +731,9 @@ inputs:
 				if cfg.Pipeline.Seriatim.Timeout != "10m" {
 					t.Fatalf("seriatim.timeout = %q, want %q", cfg.Pipeline.Seriatim.Timeout, "10m")
 				}
+				if cfg.Pipeline.Seriatim.Binary != "seriatim" {
+					t.Fatalf("seriatim.binary = %q, want %q", cfg.Pipeline.Seriatim.Binary, "seriatim")
+				}
 				if cfg.Pipeline.Seriatim.OutputSchema != "seriatim-intermediate" {
 					t.Fatalf("seriatim.output_schema = %q, want %q", cfg.Pipeline.Seriatim.OutputSchema, "seriatim-intermediate")
 				}
@@ -725,17 +746,20 @@ inputs:
 				if cfg.Pipeline.Audita.Timeout != "3h" {
 					t.Fatalf("audita.timeout = %q, want %q", cfg.Pipeline.Audita.Timeout, "3h")
 				}
+				if cfg.Pipeline.Audita.Binary != "audita" {
+					t.Fatalf("audita.binary = %q, want %q", cfg.Pipeline.Audita.Binary, "audita")
+				}
 				if cfg.Pipeline.Audita.LLMAPIKeyEnv != "" {
 					t.Fatalf("audita.llm_api_key_env = %q, want empty by default", cfg.Pipeline.Audita.LLMAPIKeyEnv)
 				}
 				if cfg.Pipeline.Audita.Modules != nil {
 					t.Fatalf("audita.modules = %#v, want nil default (optional override)", cfg.Pipeline.Audita.Modules)
 				}
-				if cfg.Pipeline.Audita.BaseURL != "https://openrouter.ai/api/v1" {
-					t.Fatalf("audita.base_url = %q, want %q", cfg.Pipeline.Audita.BaseURL, "https://openrouter.ai/api/v1")
+				if cfg.Pipeline.Audita.BaseURL != "" {
+					t.Fatalf("audita.base_url = %q, want empty default", cfg.Pipeline.Audita.BaseURL)
 				}
-				if cfg.Pipeline.Audita.Model != "openrouter/google/gemma-4-31b-it" {
-					t.Fatalf("audita.model = %q, want %q", cfg.Pipeline.Audita.Model, "openrouter/google/gemma-4-31b-it")
+				if cfg.Pipeline.Audita.Model != "" {
+					t.Fatalf("audita.model = %q, want empty default", cfg.Pipeline.Audita.Model)
 				}
 				if cfg.Pipeline.Audita.ValidationModel != "" {
 					t.Fatalf("audita.validation_model = %q, want empty default", cfg.Pipeline.Audita.ValidationModel)

internal/config/scriptorium_test.go

@@ -49,11 +49,19 @@ func TestScriptoriumLoadAndValidate(t *testing.T) {
 			wantLoadErr: "strict decode failed",
 		},
 		{
-			name: "missing binary fails when section present",
+			name: "missing binary defaults when section present",
 			scriptoriumYAML: `scriptorium:
   timeout: 10m
 `,
-			wantValidateErr: "pipeline.scriptorium.binary is required",
+			assert: func(t *testing.T, cfg *Config) {
+				t.Helper()
+				if cfg.Pipeline.Scriptorium == nil {
+					t.Fatal("scriptorium config should be present")
+				}
+				if cfg.Pipeline.Scriptorium.Binary != "scriptorium" {
+					t.Fatalf("scriptorium.binary = %q, want scriptorium", cfg.Pipeline.Scriptorium.Binary)
+				}
+			},
 		},
 		{
 			name: "enabled artifact missing prompt id fails",

internal/config/validate.go

@@ -276,9 +276,6 @@ func validateAudita(cfg AuditaConfig) error {
 			return fmt.Errorf("pipeline.audita.base_url must be a valid URL")
 		}
 	}
-	if strings.TrimSpace(cfg.Model) == "" {
-		return fmt.Errorf("pipeline.audita.model is required")
-	}
 	if cfg.TotalLLMConcurrency != nil && *cfg.TotalLLMConcurrency <= 0 {
 		return fmt.Errorf("pipeline.audita.total_llm_concurrency must be > 0")
 	}