feat(config): add Chezmoi Re-Add pre-command to capture local dotfile drift

dot_config/topgrade.toml

@@ -82,7 +82,11 @@ upgrade = false
 
 [pre_commands]
 # "Emacs Snapshot" = "rm -rf ~/.emacs.d/elpa.bak && cp -rl ~/.emacs.d/elpa ~/.emacs.d/elpa.bak"
-"Dotstate Sync" = "dotstate sync"
+# Capture local drift in managed dotfiles back into the chezmoi source repo
+# before anything upgrades. Note: only re-adds *managed* files; brand-new
+# configs still need a manual `chezmoi add`. Review/commit in
+# ~/.local/share/chezmoi afterwards.
+"Chezmoi Re-Add" = "chezmoi re-add"
 "GHQ Update" = "ghq list | ghq get -u -s"