refactor: 函数 strict 标志入 IR/编译/缓存链（零行为地基）

crates/oxide_emit/src/stmt/declaration/function_decl.rs

@@ -43,14 +43,15 @@ impl Emitter {
             self.push_rest_param(&rest.rest.argument, &mut param_names)?;
         }
         let body_stmts: &[Statement] = if let Some(body) = &fd.body { &body.statements } else { &[] };
+        let own_strict = fd.has_use_strict_directive();
         let mut sub_module = if fd.generator && fd.r#async {
-            self.compile_async_generator_body(&param_names, body_stmts, ctx)?
+            self.compile_async_generator_body(&param_names, body_stmts, ctx, own_strict)?
         } else if fd.generator {
-            self.compile_generator_body(&param_names, body_stmts, ctx)?
+            self.compile_generator_body(&param_names, body_stmts, ctx, own_strict)?
         } else if fd.r#async {
-            self.compile_async_body(&param_names, body_stmts, ctx, false, false)?
+            self.compile_async_body(&param_names, body_stmts, ctx, false, false, own_strict)?
         } else {
-            self.compile_function_body(&param_names, body_stmts, ctx, false, false)?
+            self.compile_function_body(&param_names, body_stmts, ctx, false, false, own_strict)?
         };
         sub_module.function_name = Some(name.clone());
         ctx.nested.push(sub_module);