feat(tools): add a reproducible terminal capture harness

Records on a throwaway Xvfb display at fixed geometry, drives the session with
xdotool, and quantises through a per-clip palette so the terminal's colours
survive instead of dithering.

tools/record-kitty.sh

@@ -0,0 +1,57 @@
+#!/usr/bin/env bash
+
+source "$(dirname "${BASH_SOURCE[0]}")/record-lib.sh"
+
+GEOMETRY=${GEOMETRY:-1120x680}
+EXAMPLE="$ROOT/examples/raytracer"
+OUT="$ROOT/assets/kitty.gif"
+WORK=$(mktemp -d)
+
+git -C "$ROOT" stash list >/dev/null 2>&1 || true
+cp -a "$EXAMPLE" "$WORK/raytracer"
+rm -rf "$WORK/raytracer/build"
+mkdir -p "$WORK/bin"
+ln -sf "$ROOT/meowc" "$WORK/bin/meowc"
+
+start_xvfb "$GEOMETRY"
+
+kitty \
+    --config "$HOME/.config/kitty/kitty.conf" \
+    -o remember_window_size=no \
+    -o "initial_window_width=${GEOMETRY%x*}" \
+    -o "initial_window_height=${GEOMETRY#*x}" \
+    -o confirm_os_window_close=0 \
+    --directory "$WORK/raytracer" \
+    -- bash --noprofile --norc >/dev/null 2>&1 &
+KITTY_PID=$!
+sleep 3
+
+xdotool search --sync --onlyvisible --class kitty windowactivate >/dev/null 2>&1 || true
+xdotool type --delay 10 -- 'export PS1="raytracer \$ " PATH='"$WORK"'/bin:$PATH; clear'
+xdotool key Return
+sleep 1
+
+start_capture "$GEOMETRY" "$WORK/kitty.mkv"
+
+send_line 'meowc build' 7
+send_line '# Nothing changed' 0.6
+send_line 'meowc build' 2.5
+send_line '# Every mtime moves, not one byte does' 0.6
+send_line 'touch src/*/*.c include/*.h' 0.8
+send_line 'meowc build' 2.5
+send_line '# Recolour a sphere in the scene description' 0.6
+send_line "sed -i 's/0.22 0.42/0.20 0.70/' scenes/studio.scene" 0.8
+send_line '# Codegen reruns, only what reads it rebuilds' 0.6
+send_line 'meowc build' 3.5
+send_line '# A comment only edit: recompiled, cascade stops' 0.6
+send_line "sed -i '1i // early cutoff' src/math/vec3.c" 0.8
+send_line 'meowc build' 3
+send_line 'meowc test' 5
+
+sleep 2
+stop_capture
+kill "$KITTY_PID" 2>/dev/null || true
+
+to_gif "$WORK/kitty.mkv" "$OUT" 11
+rm -rf "$WORK"
+echo "wrote $OUT"