feat(server): a deliberate powerlevel10k prompt instead of the wizard's

p10k is now installed on shron, so the red prompt the role split was built
around finally applies to the machine it was meant for. Cloned into
$ZSH_CUSTOM/themes rather than installed as a package: no root, nothing outside
the user's home, and undone by deleting a directory.

Without a configuration p10k runs its setup wizard on the first interactive
shell. Over SSH that is a login that sits there waiting for an answer, so the
server gets a written configuration and the wizard is disabled outright.

It is not a copy of beastix's. That one assumes a Nerd Font and a wide
terminal; a server is reached from whatever is at hand, so this uses ASCII,
one line, and a short segment list. user@host is always shown, on red - which
is the whole point.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

.config/zsh/p10k-server.zsh

@@ -0,0 +1,45 @@
+# powerlevel10k configuration for the server role.
+#
+# Deliberately not the wizard's output. A server is reached from whatever
+# terminal happens to be at hand, so this uses ASCII rather than the icon set
+# that assumes a Nerd Font, and keeps the segment list short enough to read at
+# a glance during an incident.
+#
+# Sourced from 50-server.zsh, which runs after oh-my-zsh has loaded
+# powerlevel10k - the same point in the sequence at which p10k expects its own
+# ~/.p10k.zsh. beastix keeps its own file and is untouched by this.
+
+# No glyphs. The prompt has to be legible from a phone terminal too.
+typeset -g POWERLEVEL9K_MODE=ascii
+typeset -g POWERLEVEL9K_ICON_PADDING=none
+
+# One line, no frame. Nothing decorative survives being read in a hurry.
+typeset -g POWERLEVEL9K_PROMPT_ON_NEWLINE=false
+typeset -g POWERLEVEL9K_RPROMPT_ON_NEWLINE=false
+typeset -g POWERLEVEL9K_LEFT_PROMPT_ELEMENTS=(context dir vcs prompt_char)
+typeset -g POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS=(status command_execution_time time)
+
+# The point of the whole exercise: user@host, always, in red. shron carries
+# mail, web and cloud, and the prompt should answer "which machine is this"
+# before the next command is typed.
+typeset -g POWERLEVEL9K_ALWAYS_SHOW_CONTEXT=true
+typeset -g POWERLEVEL9K_ALWAYS_SHOW_USER=true
+typeset -g POWERLEVEL9K_CONTEXT_TEMPLATE='%n@%m'
+typeset -g POWERLEVEL9K_CONTEXT_BACKGROUND=red
+typeset -g POWERLEVEL9K_CONTEXT_FOREGROUND=white
+typeset -g POWERLEVEL9K_CONTEXT_DEFAULT_BACKGROUND=red
+typeset -g POWERLEVEL9K_CONTEXT_DEFAULT_FOREGROUND=white
+typeset -g POWERLEVEL9K_CONTEXT_ROOT_BACKGROUND=red
+typeset -g POWERLEVEL9K_CONTEXT_ROOT_FOREGROUND=yellow
+
+typeset -g POWERLEVEL9K_DIR_BACKGROUND=blue
+typeset -g POWERLEVEL9K_DIR_FOREGROUND=white
+typeset -g POWERLEVEL9K_SHORTEN_STRATEGY=truncate_to_unique
+
+# Only mention how long something took when it was long enough to notice.
+typeset -g POWERLEVEL9K_COMMAND_EXECUTION_TIME_THRESHOLD=3
+typeset -g POWERLEVEL9K_TIME_FORMAT='%D{%H:%M}'
+
+# Instant prompt would need a cache file this machine has no reason to carry.
+typeset -g POWERLEVEL9K_INSTANT_PROMPT=off
+typeset -g POWERLEVEL9K_DISABLE_CONFIGURATION_WIZARD=true

.config/zsh/rc.d/50-server.zsh

@@ -3,15 +3,14 @@
 # The theme and DISABLE_AUTO_UPDATE are in 05-pre-omz.zsh, because oh-my-zsh
 # reads them while it is being sourced.
 
-# Role colour, set here rather than earlier because ~/.p10k.zsh assigns
-# POWERLEVEL9K_CONTEXT_BACKGROUND itself and is sourced in 30-path.zsh.
+# The prompt, in a file of its own because there is more to it than a colour.
+# Sourced here rather than earlier: this is the point at which oh-my-zsh has
+# loaded powerlevel10k, which is where p10k expects its configuration.
 #
-# Note that this only takes effect where powerlevel10k is installed, and on
-# shron it is not - the ys theme has no equivalent. The colour is kept anyway
-# so it works the moment p10k arrives, but the red prompt cannot be relied on
-# as a safeguard there today.
-typeset -g POWERLEVEL9K_CONTEXT_BACKGROUND=red
-typeset -g POWERLEVEL9K_ALWAYS_SHOW_CONTEXT=true
+# beastix keeps its own ~/.p10k.zsh, sourced from 30-path.zsh. This one is
+# separate because a server is reached from whatever terminal is at hand and
+# cannot assume the desktop's Nerd Font.
+[[ -r "$HOME/.config/zsh/p10k-server.zsh" ]] && source "$HOME/.config/zsh/p10k-server.zsh"
 
 # German locale. The base does not set one, since the desktop inherits it from
 # the session and the Mac has its own; an SSH session brings only what the