sync: lock down plan9 theme, wallpapers, nvim configs
- setbg: add -w (wallpaper-only), -d (default plan9 theme), terminal color reset
- wallpapers: plan9.png, plan9theme.png, plan9-grey.png, d1e2f1-horizontal
- nvim: add code/ and write/ NVIM_APPNAME configs (vacme + writing themes)
- bin: add write, code scripts (replace shell functions)
- xprofile: caps:none, dpms off, setfan, gnome-keyring, wireplumber, conky, protonmail
- wal: add colors-dwm-xresources template, remove stale btop.theme
- conky: add clock.conf, clock.lua, local.conf