chore(config): add .config/mise ignore patterns for local tool versions

.chezmoiignore.tmpl

@@ -16,6 +16,10 @@ AGENTS.md
 .config/nvim/.crush/**
 .config/nvim/.understand-anything/**
 
+# mise tool versions — kept local per-machine, not managed
+.config/mise
+.config/mise/**
+
 {{ if or (ne .chezmoi.os "linux") (and (ne .role "desktop") (ne .role "laptop")) }}
 # Arch desktop layer — linux desktop/laptop roles only
 .config/niri