feat: split git user identity by repo directory

Leave global name/email empty with useConfigOnly so unmatched repos cannot commit. Personal identity applies under ~/.dotfile, ~/code, and ~/.pouch; work identity stays in local ~/.gitconfig.work for ~/workrepo.

git/.gitconfig

@@ -1,6 +1,7 @@
+# 不设全局 user.name / user.email，避免未匹配目录误用身份。
+# useConfigOnly（Git 2.8+）：未配置时拒绝 commit，而不是猜系统用户名。
 [user]
-  name = laily
-  email = i@laily.net
+  useConfigOnly = true
 [core]
   autocrlf = input
   quotepath = false
@@ -42,8 +43,16 @@
 [mergetool "nvimdiff"]
   cmd = nvim -d \"$LOCAL\" \"$REMOTE\" -ancestor \"$BASE\" -merge \"$MERGED\"
   trustExitCode = true
+# 按仓库目录套身份。个人身份在 git/.gitconfig.personal；公司邮箱只放本机 ~/.gitconfig.work。
+# include 目标文件必须存在，否则该目录下 git 命令会直接 fatal。
+[includeIf "gitdir:~/.dotfile/"]
+  path = ~/.dotfile/git/.gitconfig.personal
+[includeIf "gitdir:~/code/"]
+  path = ~/.dotfile/git/.gitconfig.personal
+[includeIf "gitdir:~/.pouch/"]
+  path = ~/.dotfile/git/.gitconfig.personal
 [includeIf "gitdir:~/workrepo/"]
-  path = ~/.workgitconfig
+  path = ~/.gitconfig.work
 [rebase]
   autoSquash = true
   autoStash = true

git/.gitconfig.personal

@@ -0,0 +1,4 @@
+# 个人身份：~/.dotfile、~/code、~/.pouch（由 includeIf gitdir 加载）
+[user]
+  name = laily
+  email = i@laily.net