Add git dotfiles with Dotter templates

Set up .gitconfig and .gitignore under Dotter management with template variables for git_name and git_email to support different values across systems.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.dotter/global.toml

@@ -0,0 +1,13 @@
+[helpers]
+
+[git]
+depends = []
+
+[git.files]
+"git/.gitconfig" = "~/.gitconfig"
+"git/.gitignore" = "~/.gitignore"
+
+[git.variables]
+
+[settings]
+default_target_type = "automatic"

.gitignore

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+# Dotter cache files
+.dotter/local.toml
+.dotter/cache.toml
+.dotter/cache/

git/.gitconfig

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+[core]
+	excludesFile = ~/.gitignore
+[push]
+	autoSetupRemote = true
+[user]
+	name = {{git_name}}
+	email = {{git_email}}
+[filter "lfs"]
+	clean = git-lfs clean -- %f
+	smudge = git-lfs smudge -- %f
+	process = git-lfs filter-process
+	required = true
+[init]
+	defaultBranch = main

git/.gitignore

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+.history/
+