feat(iso): ship kitty.conf + tmux.conf defaults and xterm rescue fallback

Closes the OOTB config gaps from the kitty swap (b4c86b6). Kitty installed but
shipped with bare defaults and no tmux passthrough; rescue path lost its
headless fallback when xfce4-terminal was removed.

Changes:
- panel-skel/.config/kitty/kitty.conf: font 13pt (Hack, from hack-font pkg),
  quiet-dark theme + full 16-color palette, scrollback, tab bar, beam cursor.
  Lands at ~/.config/kitty/kitty.conf for the clawdie user via existing
  panel-skel staging (no build.sh change).
- panel-skel/.config/tmux/tmux.conf: extended-keys on + csi-u so modifier
  keys (Shift-Enter, Ctrl-Arrow, Alt-Enter) reach TUIs (pi, zot, colibri-tui)
  run inside tmux. XDG path (~/.config/tmux/tmux.conf), read natively by the
  live USB's tmux 3.5a. Plus escape-time 0, focus-events, mouse, sane indexing.
- clawdie-xfce-session-inner: rescue terminal now falls back kitty -> xterm.
  Kitty is GPU-only; without a GL surface (bhyve no-GPU VMs) it can fail to
  start, leaving the operator with no rescue shell. xterm stays installed.

No build.sh change needed: both configs ride the existing
`cp -R panel-skel/.config/.` into /etc/skel/.config and /home/clawdie/.config
(build.sh:2087, :2095).

Pre-merge: confirm `pkg search kitty` on the FreeBSD build host (couldn't
reach the network from the dev sandbox).

(Sam & Claude)

live/operator-session/clawdie-xfce-session-inner

@@ -95,9 +95,15 @@ manual_xfce_desktop() {
         if ! pgrep -U "$(id -u)" -x xfce4-panel >/dev/null 2>&1 || \
            ! pgrep -U "$(id -u)" -x xfwm4 >/dev/null 2>&1; then
             echo "Panel or window manager missing after fallback startup; opening rescue terminal"
+            # Kitty is GPU-accelerated; on a headless/bhyve surface with no GL
+            # it may fail to start. Fall back to xterm (always installed) so the
+            # rescue shell stays reachable even without a working GPU.
             if command -v kitty >/dev/null 2>&1; then
                 kitty -T "Clawdie desktop rescue" \
                     sh -lc 'echo XFCE startup fallback. See ~/.xsession-errors.; exec sh' &
+            elif command -v xterm >/dev/null 2>&1; then
+                xterm -T "Clawdie desktop rescue" \
+                    -e sh -lc 'echo XFCE startup fallback. See ~/.xsession-errors.; exec sh' &
             fi
         fi
     ) &

live/operator-session/panel-skel/.config/kitty/kitty.conf

@@ -0,0 +1,66 @@
+# Clawdie operator USB — Kitty terminal defaults
+# Ships at ~/.config/kitty/kitty.conf for the clawdie user.
+# Tweak freely; reload live with Ctrl+Shift+F5 (or restart kitty).
+# Pick a different look interactively:  kitty +kitten themes
+# Full reference:                      man kitty.conf
+
+# ── Font ───────────────────────────────────────────────────
+# Hack ships via the `hack-font` package on the live USB. Bumped above
+# kitty's 11pt default so operator dashboards (colibri-tui, tmux, pi) stay
+# legible on laptop panels.
+font_family      Hack
+bold_font        auto
+italic_font      auto
+bold_italic_font auto
+font_size        13.0
+
+# ── Window ─────────────────────────────────────────────────
+remember_window_size  no
+initial_window_width  110c
+initial_window_height 30c
+window_padding_width  6
+hide_window_decorations no
+
+# ── Scrollback / mouse ─────────────────────────────────────
+scrollback_lines 10000
+copy_on_select   yes
+url_style        curly
+open_url_with    default
+strip_trailing_spaces always
+
+# ── Tab bar (only when more than one tab is open) ──────────
+tab_bar_min_tabs  2
+tab_bar_edge      bottom
+tab_bar_style     powerline
+tab_title_template {title}
+
+# ── Theme: quiet dark ──────────────────────────────────────
+# A calm, high-contrast dark scheme tuned for long operator sessions.
+# Programs that use the 16 ANSI colors (ls, git, vim, syntax highlighters)
+# stay coherent with the foreground/background.
+foreground              #c8d3f5
+background              #1b1d2b
+cursor                  #c8d3f5
+selection_foreground    #1b1d2b
+selection_background    #3b3f54
+
+color0   #1b1d2b
+color8   #5b6078
+color1   #f7768e
+color9   #f7768e
+color2   #9ece6a
+color10  #9ece6a
+color3   #e0af68
+color11  #e0af68
+color4   #7aa2f7
+color12  #7aa2f7
+color5   #bb9af7
+color13  #bb9af7
+color6   #7dcfff
+color14  #7dcfff
+color7   #a9b1d6
+color15  #c0caf5
+
+# ── Cursor ─────────────────────────────────────────────────
+cursor_shape          beam
+cursor_blink_interval 0

live/operator-session/panel-skel/.config/tmux/tmux.conf

@@ -0,0 +1,31 @@
+# Clawdie operator USB — tmux defaults
+# Ships at ~/.config/tmux/tmux.conf (tmux 3.1+ reads the XDG path; the live
+# USB's tmux port is 3.5a). Reload after edits:
+#   tmux source-file ~/.config/tmux/tmux.conf
+
+# ── Modifier-key passthrough (the reason this file exists) ─
+# Kitty reports Shift/Ctrl/Alt-modified keys; tmux must forward them so TUIs
+# (pi, zot, colibri-tui) receive Shift-Enter, Ctrl-Arrow, Alt-Enter, etc.
+# csi-u is the most reliable format and needs tmux 3.5+ (we have 3.5a).
+set -g extended-keys on
+set -g extended-keys-format csi-u
+
+# ── Responsiveness ──────────────────────────────────────────
+# Zero escape time so TUIs (ratatui, pi, vim) feel instant; forward focus
+# events so apps that track focus react promptly.
+set -s escape-time 0
+set -sg focus-events on
+
+# ── History ─────────────────────────────────────────────────
+set -g history-limit 50000
+
+# ── Window numbering matches the keyboard, renumber on close ─
+set -g base-index 1
+setw -g pane-base-index 1
+set -g renumber-windows on
+
+# ── Mouse (operator convenience: select, scroll, resize) ────
+set -g mouse on
+
+# ── Don't let running apps rename windows out from under us ─
+set -g allow-rename off