Add Switch OTA launcher with unified SD zip and quiet UI.

Ships a dual-NRO native launcher that checks GitHub Releases, updates both NROs from gen1recomp-*-switch.zip with matching NACP versions, and stays silent unless an update needs confirm.

scripts/switch/build_ota_launcher.sh

@@ -0,0 +1,74 @@
+#!/usr/bin/env bash
+# Build the native Switch OTA launcher NRO (DEVKITPRO or Docker).
+#
+# Usage: scripts/switch/build_ota_launcher.sh [OUT_NRO] [VERSION]
+#
+# Default OUT_NRO: dist/switch/gen1recomp-launcher.nro
+# VERSION (optional X.Y.Z) is written into the NACP so hbmenu shows the
+# same release as the fused game; defaults to 0.0.0 when omitted.
+# Host-only protocol check: always runs `make host-test` first.
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+# shellcheck source=common.sh
+. "$SCRIPT_DIR/common.sh"
+
+LAUNCHER_DIR="$ROOT/native/switch-ota-launcher"
+OUT_NRO="${1:-$ROOT/dist/switch/gen1recomp-launcher.nro}"
+APP_VERSION="${2:-${GEN1_LAUNCHER_VERSION:-0.0.0}}"
+DKP_IMAGE_FILE="$ROOT/scripts/switch/dkp-docker.image"
+
+[ -d "$LAUNCHER_DIR" ] || fail "missing $LAUNCHER_DIR"
+[ -f "$LAUNCHER_DIR/Makefile" ] || fail "missing Makefile"
+
+say "host-test ota_protocol (no DEVKITPRO required)"
+make -C "$LAUNCHER_DIR" host-test
+
+mkdir -p "$(dirname "$OUT_NRO")"
+
+if [ -n "${DEVKITPRO:-}" ] && [ -f "$DEVKITPRO/libnx/switch_rules" ]; then
+  say "building launcher NRO with native DEVKITPRO (NACP $APP_VERSION)"
+  make -C "$LAUNCHER_DIR" clean || true
+  make -C "$LAUNCHER_DIR" all APP_VERSION="$APP_VERSION"
+  cp "$LAUNCHER_DIR/gen1recomp.nro" "$OUT_NRO"
+  say "wrote $OUT_NRO"
+  exit 0
+fi
+
+resolve_dkp_image() {
+  if [ -n "${GEN1_DKP_IMAGE:-}" ]; then
+    printf '%s' "$GEN1_DKP_IMAGE"
+    return 0
+  fi
+  [ -f "$DKP_IMAGE_FILE" ] || fail "missing Docker image pin: $DKP_IMAGE_FILE"
+  local line
+  line="$(grep -v '^[[:space:]]*#' "$DKP_IMAGE_FILE" | grep -v '^[[:space:]]*$' | head -1 || true)"
+  [ -n "$line" ] || fail "empty Docker image pin: $DKP_IMAGE_FILE"
+  printf '%s' "$line"
+}
+
+if command -v docker >/dev/null 2>&1; then
+  image="$(resolve_dkp_image)"
+  say "building launcher NRO via Docker ($image, NACP $APP_VERSION)"
+  docker run --rm \
+    -v "$ROOT:/work" \
+    -w /work/native/switch-ota-launcher \
+    -e "APP_VERSION=$APP_VERSION" \
+    "$image" \
+    bash -lc 'pacman -Sy --noconfirm switch-curl switch-mbedtls switch-zlib switch-zziplib >/dev/null 2>&1 || true; make clean; make all APP_VERSION="$APP_VERSION"'
+  cp "$LAUNCHER_DIR/gen1recomp.nro" "$OUT_NRO"
+  say "wrote $OUT_NRO"
+  exit 0
+fi
+
+fail "$(cat <<EOF
+Cannot build Switch OTA launcher NRO: DEVKITPRO unset and Docker unavailable.
+
+Host protocol tests already passed (make host-test).
+Install DEVKITPRO switch-dev + switch-curl, or Docker, then re-run:
+  scripts/switch/build_ota_launcher.sh
+
+See native/switch-ota-launcher/README.md and docs/switch-build.md.
+EOF
+)"