Add output schema registry and public contract docs

internal/core/config/config_test.go

@@ -12,6 +12,9 @@ func TestDefaultConfigValues(t *testing.T) {
 	if got, want := strings.Join(cfg.Modules, ","), DefaultModulesCSV; got != want {
 		t.Fatalf("modules mismatch: got %q want %q", got, want)
 	}
+	if cfg.OutputSchema != DefaultOutputSchema {
+		t.Fatalf("unexpected default output schema: %q", cfg.OutputSchema)
+	}
 	if cfg.PrimaryLLM.Model != DefaultPrimaryModel {
 		t.Fatalf("unexpected default primary model: %q", cfg.PrimaryLLM.Model)
 	}
@@ -186,12 +189,14 @@ func TestApplyCLIOverridesPrecedence(t *testing.T) {
 	model := "cli-model"
 	workDir := "/cli/work"
 	modules := "grammar"
+	outputSchema := "audita-v1"
 	totalLLMConcurrency := 5
 	proposalLLMConcurrency := 3
 	overrides := CLIOverrides{
 		PrimaryModel:           &model,
 		WorkDir:                &workDir,
 		ModulesCSV:             &modules,
+		OutputSchema:           &outputSchema,
 		TotalLLMConcurrency:    &totalLLMConcurrency,
 		ProposalLLMConcurrency: &proposalLLMConcurrency,
 	}
@@ -209,6 +214,9 @@ func TestApplyCLIOverridesPrecedence(t *testing.T) {
 	if !reflect.DeepEqual(cfg.Modules, []string{"grammar"}) {
 		t.Fatalf("unexpected modules: %#v", cfg.Modules)
 	}
+	if cfg.OutputSchema != "audita-v1" {
+		t.Fatalf("expected CLI output schema override, got %q", cfg.OutputSchema)
+	}
 	if cfg.TotalLLMConcurrency != 5 {
 		t.Fatalf("expected CLI total concurrency override, got %d", cfg.TotalLLMConcurrency)
 	}
@@ -275,6 +283,7 @@ func TestApplyCLIOverridesCanonicalTotalWinsLegacyAlias(t *testing.T) {
 
 func TestValidationFailures(t *testing.T) {
 	cfg := Default()
+	cfg.OutputSchema = "unknown-schema"
 	cfg.PrimaryLLM.TimeoutSeconds = -1
 	cfg.TotalLLMConcurrency = 0
 	cfg.ProposalLLMConcurrency = 0
@@ -301,6 +310,7 @@ func TestValidationFailures(t *testing.T) {
 		"min section tokens",
 		"grammar confidence threshold",
 		"work dir retention",
+		"unsupported output schema",
 	} {
 		if !strings.Contains(message, expected) {
 			t.Fatalf("expected error to contain %q, got %q", expected, message)