Align SLURP access control with config authority levels

pkg/config/config.go

@@ -274,14 +274,13 @@ func (c *Config) ApplyRoleDefinition(role string) error {
 }
 
 // GetRoleAuthority returns the authority level for a role (from CHORUS)
-func (c *Config) GetRoleAuthority(role string) (string, error) {
-	// This would contain the authority mapping from CHORUS
-	switch role {
-	case "admin":
-		return "master", nil
-	default:
-		return "member", nil
+func (c *Config) GetRoleAuthority(role string) (AuthorityLevel, error) {
+	roles := GetPredefinedRoles()
+	if def, ok := roles[role]; ok {
+		return def.AuthorityLevel, nil
 	}
+
+	return AuthorityReadOnly, fmt.Errorf("unknown role: %s", role)
 }
 
 // Helper functions for environment variable parsing