Add output schema registry and public contract docs

internal/core/config/flags.go

@@ -7,6 +7,7 @@ import (
 
 type CLIOverrides struct {
 	ModulesCSV                    *string
+	OutputSchema                  *string
 	PrimaryLLMAPIKey              *string
 	ValidationLLMAPIKey           *string
 	PrimaryModel                  *string
@@ -46,6 +47,9 @@ func (c *Config) ApplyCLIOverrides(overrides CLIOverrides) error {
 		}
 		c.Modules = modules
 	}
+	if overrides.OutputSchema != nil {
+		c.OutputSchema = strings.TrimSpace(*overrides.OutputSchema)
+	}
 
 	if overrides.PrimaryLLMAPIKey != nil {
 		c.PrimaryLLM.APIKey = *overrides.PrimaryLLMAPIKey