Add Audita configuration contract

internal/config/validate.go

@@ -39,7 +39,7 @@ func validatePipeline(cfg *PipelineConfig) error {
 	if err := validateSeriatim(cfg.Seriatim); err != nil {
 		return err
 	}
-	if err := validateDuration("pipeline.audita.timeout", cfg.Audita.Timeout); err != nil {
+	if err := validateAudita(cfg.Audita); err != nil {
 		return err
 	}
 	if err := validateDuration("pipeline.analyzer.timeout", cfg.Analyzer.Timeout); err != nil {
@@ -122,6 +122,57 @@ func validateSeriatim(cfg SeriatimConfig) error {
 	return nil
 }
 
+func validateAudita(cfg AuditaConfig) error {
+	if strings.TrimSpace(cfg.Binary) == "" {
+		return fmt.Errorf("pipeline.audita.binary is required")
+	}
+	if err := validateDuration("pipeline.audita.timeout", cfg.Timeout); err != nil {
+		return err
+	}
+	if strings.TrimSpace(cfg.LLMAPIKeyEnv) == "" {
+		return fmt.Errorf("pipeline.audita.llm_api_key_env is required")
+	}
+	if len(cfg.Modules) == 0 {
+		return fmt.Errorf("pipeline.audita.modules must include at least one module")
+	}
+	for i, mod := range cfg.Modules {
+		m := strings.TrimSpace(mod)
+		if m == "" {
+			return fmt.Errorf("pipeline.audita.modules[%d] must be non-empty", i)
+		}
+		switch m {
+		case "glossary", "homophones", "spoken_word", "grammar":
+		default:
+			return fmt.Errorf("pipeline.audita.modules[%d] must be one of: glossary, homophones, spoken_word, grammar", i)
+		}
+	}
+	if strings.TrimSpace(cfg.BaseURL) != "" {
+		u, err := url.Parse(cfg.BaseURL)
+		if err != nil || u.Scheme == "" || u.Host == "" {
+			if err != nil {
+				return fmt.Errorf("pipeline.audita.base_url must be a valid URL: %w", err)
+			}
+			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.LLMConcurrency == nil {
+		return fmt.Errorf("pipeline.audita.llm_concurrency must be set (defaults should populate this)")
+	}
+	if *cfg.LLMConcurrency <= 0 {
+		return fmt.Errorf("pipeline.audita.llm_concurrency must be > 0")
+	}
+	if cfg.ValidationLLMConcurrency == nil {
+		return fmt.Errorf("pipeline.audita.validation_llm_concurrency must be set (defaults should populate this)")
+	}
+	if *cfg.ValidationLLMConcurrency <= 0 {
+		return fmt.Errorf("pipeline.audita.validation_llm_concurrency must be > 0")
+	}
+	return nil
+}
+
 func validateSession(cfg *SessionConfig) error {
 	if strings.TrimSpace(cfg.SessionID) == "" {
 		return fmt.Errorf("session.session_id is required")