refactor: CompileCtx 拆分为 LabelCtx/ScopeCtx，字面量域改用注册表入口

crates/oxide_compiler/src/counter/expr/literal.rs

@@ -1,6 +1,17 @@
 use super::*;
 
 impl Compiler {
+    /// Domain entry point: count any literal expression. The central
+    /// `count_expression` match delegates all literal variants here in one arm.
+    /// Numeric/String/Boolean/Null share the default single-`LOAD_CONST` shape;
+    /// RegExp emits three instructions.
+    pub(in crate::counter) fn count_literal(&self, expr: &Expression, ctx: &mut CompileCtx) {
+        match expr {
+            Expression::RegExpLiteral(_) => self.count_regexp_literal(ctx),
+            _ => self.count_default_expression(ctx),
+        }
+    }
+
     pub(in crate::counter) fn count_this_expression(&self, ctx: &mut CompileCtx) {
         ctx.alloc_reg();
         ctx.projected_pc += 1; // LOAD_VAR from reg 254