fix: standalone bundle + standardrb clean

- Gemfile: fall back to the published interscript-maps gem when no
  sibling ../maps checkout exists, so the repo bundles standalone
  (mirrors the existing secryst group pattern)
- Clear all remaining standardrb offenses in lib/: mechanical
  corrections (chars, and/or precedence, paren-wrapped assignment),
  explicit directives for deliberate patterns (eval-based compiler,
  method_missing DSL, execution-context globals, debug hooks)
- Verified zero behavior change: transliteration smoke test identical
  before/after

Author: ronaldtse

lib/interscript/compiler/ruby.rb

@@ -1,3 +1,4 @@
+# rubocop:disable Style/GlobalVars, Security/Eval -- map-evaluation context globals; eval runs generated map code
 $main_binding = binding
 
 class Interscript::Compiler::Ruby < Interscript::Compiler
@@ -264,3 +265,4 @@ def self.reset_debug_data
     $map_debug = []
   end
 end
+# rubocop:enable Style/GlobalVars, Security/Eval

lib/interscript/utils/helpers.rb

@@ -1,3 +1,5 @@
+# rubocop:disable Style/GlobalVars
+# spec-support globals; deliberate process-level state
 module Interscript::Utils
   module Helpers
     def document name = nil, &block
@@ -37,3 +39,4 @@ def parse(map_name, **kwargs)
     end
   end
 end
+# rubocop:enable Style/GlobalVars