chezmoi v2: omz + p10k + fzf + vi-mode zsh, tmux, per-account gitconfig (#612)

Rewrote the Aug-1 sandbox-era source into a full workstation setup for
both ultix-streaming accounts: oh-my-zsh with autosuggestions/
syntax-highlighting/completions + powerlevel10k (pinned externals),
fzf wiring, vi mode, tmux conf, aliases under ~/.config/zsh, gitconfig
template that keeps hooksPath/tea for reachableceo only.

Detail + verification: https://projects.knownelement.com/issues/612#note-3335

dot_tmux.conf

@@ -0,0 +1,33 @@
+# ~/.tmux.conf — chezmoi-managed. Ctrl-a prefix, mouse, vi copy mode.
+
+unbind C-b
+set -g prefix C-a
+bind C-a send-prefix
+
+set -g mouse on
+set -g history-limit 100000
+set -g default-terminal "tmux-256color"
+set -ga terminal-overrides ",xterm-256color:RGB"
+set -sg escape-time 10
+set -g focus-events on
+set -g base-index 1
+setw -g pane-base-index 1
+set -g renumber-windows on
+
+bind | split-window -h -c "#{pane_current_path}"
+bind - split-window -v -c "#{pane_current_path}"
+bind c new-window -c "#{pane_current_path}"
+
+bind h select-pane -L
+bind j select-pane -D
+bind k select-pane -U
+bind l select-pane -R
+
+setw -g mode-keys vi
+bind -T copy-mode-vi v send -X begin-selection
+bind -T copy-mode-vi y send -X copy-selection-and-cancel
+
+set -g status-style "bg=default,fg=default"
+set -g status-left "#[fg=cyan,bold][#S] "
+set -g status-right "#[fg=cyan]%H %Y-%m-%d %H:%M "
+set -g status-right-length 50