feat: build CouchOS Melee appliance

scripts/slippi_first_run_helper.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+COUCH_HOME="${COUCH_HOME:-/home/couch}"
+REPLAY_DIR="${COUCH_HOME}/Slippi"
+CHECKLIST="${REPLAY_DIR}/FIRST_RUN_CHECKLIST.md"
+
+install -d -m 0700 "${REPLAY_DIR}"
+
+cat <<EOF
+Created/validated ${REPLAY_DIR}.
+
+Manual first-run checklist:
+1. Launch Slippi Launcher and install/update Slippi Dolphin.
+2. Point Dolphin at your own NTSC 1.02 Melee image.
+3. In Dolphin graphics, set Vulkan, fullscreen, 4:3, internal resolution 2x, and V-Sync off.
+4. Confirm replays save under ${REPLAY_DIR}.
+5. Create and save the named Xbox controller profile after device discovery.
+
+Reference template:
+${CHECKLIST}
+EOF