syntax: 删除 <- 记号（spec→实现→全库语料迁移） - #236
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- layout/tests/issue116.rs：用例 `i <- i+1` → `i = i+1`。 - site highlight / extensions tmLanguage：token 去 `<-`。
所有 `x <- e` 赋值改 `x = e`（`<-` 删除实现）。spec 示例同步；README 措辞更新。
scanner 不再产出 `<-` Arrow（与 `=` 重复的写左记号）；parser/ast/lower/symbol 去掉 `<-` 相关分支与文档，仅留 `=`（写左）/`->`（写右）。spec 先行（59a8112）， 此为实现侧收尾。
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<-与=重复，删除。spec 先行（59a8112），本 PR：scanner/parser 去<-、全库 .kvx <- e→x = e、测试/高亮同步。