Phase 4b: enum types name magic-int value spaces

enum Name { A, B, C } declares named int constants; Enum.Variant is a
compile-time int (index by declaration order), usable in match patterns,
comparisons, setreg. New: parse_enum + dispatch, enum_ordinal resolver
(emit_core), Enum.Variant handling (emit_expr). Scoped to a naming layer over
int (no enum-typed variables), so register/save semantics are untouched.

combat.ludic battle menus dispatch on KnightAct/MageAct instead of 0..3;
chronorift golden byte-identical. Editor vocab (ludic_syntax.h, JetBrains,
TextMate, emacs) gained enum, dropped retired edge/export/pure decl keywords;
check-vocabulary + test-tools 28/0. when/if kept by choice; bitwise stays
functions. Reseeded, fixpoint holds, test.sh 14/14.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/editors/jetbrains/src/main/kotlin/io/ludic/ide/LudicTokens.kt

@@ -41,8 +41,8 @@ object LudicTokens {
  */
 object LudicVocabulary {
     val DECL = setOf(
-        "game", "module", "import", "component", "struct", "archetype", "ui", "scene", "layer",
-        "const", "var", "export", "fn", "pure", "extern", "system", "edge", "start", "on"
+        "game", "module", "import", "component", "struct", "archetype", "enum", "ui", "scene", "layer",
+        "const", "var", "fn", "extern", "system", "start", "on"
     )
     val CLAUSE = setOf(
         "phase", "query", "reads", "writes", "needs", "uses",