feat(remote-dev): add Nix Home-Manager flake for Ubuntu 22 VM dev env

New remote-dev/ subdir with a Home-Manager flake that provisions a
headless dev environment on a remote Ubuntu 22.04 VM accessed via SSH.
Shares nvim, zellij, zsh, direnv, and ghostty configs from the same
dotfiles repo via mkOutOfStoreSymlink (no rebuilds on config edits).

CLI tool set mirrors the dev-tool subset of meta/base.txt; sysadmin
tools (procs, gdu, duf), lazygit, and node/yarn (only needed for
markdown-preview on GUI hosts) are excluded.

bootstrap.sh is one-shot: installs Nix via Determinate Systems
installer, clones the repo to ~/.local/share/dotfiles, runs
home-manager switch, and chshes to the nix-store zsh.

dot_config/zsh/dot_zshrc loses its hardcoded Arch plugin/git-prompt
paths in favour of a fallback search: Arch path first, then
$HOME/.nix-profile/share/. Same file works on host and VM.

.chezmoiignore: exclude remote-dev/ from chezmoi deploy on the host.

1 files changed, 27 insertions, 4 deletions

diff --git a/dot_config/zsh/dot_zshrc b/dot_config/zsh/dot_zshrc
index 552f9eb..7a9538d 100644
--- a/dot_config/zsh/dot_zshrc
+++ b/dot_config/zsh/dot_zshrc
@@ -31,7 +31,13 @@ bindkey -e
 
 # ── Prompt ────────────────────────────────────────────────────────────────────
 autoload -Uz colors && colors
-source /usr/share/git/completion/git-prompt.sh
+# git-prompt.sh: distro-managed on Arch, nix-store-managed on the VM
+for _f in \
+	/usr/share/git/completion/git-prompt.sh \
+	$HOME/.nix-profile/share/git/contrib/completion/git-prompt.sh; do
+	[[ -r $_f ]] && { source "$_f"; break; }
+done
+unset _f
 PROMPT='%B%{$fg[green]%}%n%{$reset_color%}@%{$fg[cyan]%}%m%{$reset_color%}:%b%{$fg[yellow]%}%~%{$reset_color%}$(__git_ps1 " (%s)")%(?..[%{$fg[red]%}%?%{$reset_color%}]) %(!.#.>) '
 
 # ── Completion ────────────────────────────────────────────────────────────────
@@ -375,15 +381,32 @@ _fzf_compgen_path() { fd --hidden --follow --exclude ".git" . "$1" }
 _fzf_compgen_dir()  { fd --type d --hidden --follow --exclude ".git" . "$1" }
 
 # ── Plugins (must be sourced last) ────────────────────────────────────────────
+# Plugin locations: Arch system path first, ~/.nix-profile fallback for VM HM.
+_source_first() {
+	local f
+	for f in "$@"; do
+		[[ -r $f ]] && { source "$f"; return 0; }
+	done
+	return 1
+}
+
 # Highlight config must be set BEFORE sourcing the plugin
 ZSH_HIGHLIGHT_HIGHLIGHTERS=(main brackets pattern)
 typeset -A ZSH_HIGHLIGHT_STYLES
 ZSH_HIGHLIGHT_STYLES[comment]='fg=yellow'
-source /usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
+_source_first \
+	/usr/share/zsh/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh \
+	$HOME/.nix-profile/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
 
-source /usr/share/zsh/plugins/zsh-autosuggestions/zsh-autosuggestions.zsh
+_source_first \
+	/usr/share/zsh/plugins/zsh-autosuggestions/zsh-autosuggestions.zsh \
+	$HOME/.nix-profile/share/zsh-autosuggestions/zsh-autosuggestions.zsh
 bindkey '^[[Z' autosuggest-accept  # Shift-Tab to accept suggestion
 
-source /usr/share/zsh/plugins/zsh-history-substring-search/zsh-history-substring-search.zsh
+_source_first \
+	/usr/share/zsh/plugins/zsh-history-substring-search/zsh-history-substring-search.zsh \
+	$HOME/.nix-profile/share/zsh-history-substring-search/zsh-history-substring-search.zsh
 [[ -n "${key[Up]}"   ]] && bindkey -- "${key[Up]}"   history-substring-search-up
 [[ -n "${key[Down]}" ]] && bindkey -- "${key[Down]}" history-substring-search-down
+
+unfunction _source_first