docs: 更新 archive 帮助文本，新增 finish 命令帮助

src/cli/help.ts

@@ -62,12 +62,23 @@ const COMMANDS: Record<string, CommandHelpDef> = {
   archive: {
     name: "archive",
     alias: "archive <名称>",
-    description: "归档：归档变更并生成提示词",
+    description: "归档：生成归档阶段提示词",
     usageTemplate: "archive <change-name>",
     args: [{ name: "<change-name>", desc: '变更名称，如 "add-login"' }],
-    detail: "将变更目录从 .rune/changes/ 移动到 .rune/archive/，并生成归档阶段提示词。",
+    detail:
+      "生成归档阶段的提示词。变更目录需已存在（通过 create 创建）。此命令不移动文件，仅输出提示词。",
     exampleArgs: ["archive add-user-auth", "archive fix-memory-leak"],
   },
+  finish: {
+    name: "finish",
+    alias: "finish <名称>",
+    description: "归档变更：将变更目录移动到 archive",
+    usageTemplate: "finish <change-name>",
+    args: [{ name: "<change-name>", desc: '变更名称，如 "add-login"' }],
+    detail:
+      "将变更目录从 .rune/changes/ 移动到 .rune/archive/<日期>-<变更名>。这不是独立的 SDD 阶段，而是 archive 阶段中实际执行磁盘归档的工具命令。",
+    exampleArgs: ["finish add-user-auth", "finish fix-memory-leak"],
+  },
   update: {
     name: "update",
     alias: "update <工具...>",