feat(scrape): sync GUI bridge doc into linux-x64 folder

Add sync-gui-bridge-doc.sh to copy the versioned bridge markdown beside
the GUI zip; includes offline smoke test (18 total via run-all-smokes).

scripts/sync-gui-bridge-doc.sh

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail
+
+SCRIPT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd -P)
+REPO_ROOT="${DCE_REPO_ROOT:-$(cd "$SCRIPT_DIR/.." && pwd -P)}"
+SOURCE_DOC="$REPO_ROOT/docs/gui-zip-recurring-scrape-bridge.md"
+DEFAULT_DEST="$REPO_ROOT/../DiscordChatExporter.linux-x64/RECURRING-SCRAPE.md"
+DEST_PATH="${DCE_GUI_BRIDGE_DEST:-$DEFAULT_DEST}"
+DRY_RUN=0
+
+usage() {
+  cat <<EOF
+Usage:
+  $(basename "$0") [--dest PATH] [--dry-run]
+
+Copy the versioned GUI zip quick-start from docs/gui-zip-recurring-scrape-bridge.md
+to the sibling GUI folder (default: ../DiscordChatExporter.linux-x64/RECURRING-SCRAPE.md).
+EOF
+}
+
+die() {
+  printf 'ERROR: %s\n' "$*" >&2
+  exit 1
+}
+
+main() {
+  while (($#)); do
+    case "$1" in
+      --dest)
+        [[ $# -ge 2 ]] || die "Missing value for --dest."
+        DEST_PATH=$2
+        shift 2
+        ;;
+      --dry-run)
+        DRY_RUN=1
+        shift
+        ;;
+      --help|-h)
+        usage
+        exit 0
+        ;;
+      *)
+        die "Unknown option: $1"
+        ;;
+    esac
+  done
+
+  [[ -f "$SOURCE_DOC" ]] || die "Missing source doc: $SOURCE_DOC"
+  local dest_dir
+  dest_dir=$(dirname "$DEST_PATH")
+  [[ -d "$dest_dir" ]] || die "Destination directory does not exist: $dest_dir (create it or pass --dest)"
+
+  if (( DRY_RUN == 1 )); then
+    printf 'Would copy:\n  %s\n  -> %s\n' "$SOURCE_DOC" "$DEST_PATH"
+    exit 0
+  fi
+
+  cp -f "$SOURCE_DOC" "$DEST_PATH"
+  printf 'Synced GUI bridge doc to %s\n' "$DEST_PATH"
+}
+
+main "$@"

scripts/tests/sync-gui-bridge-doc-smoke.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+set -Eeuo pipefail
+
+REPO_ROOT=$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd -P)
+SYNC="$REPO_ROOT/scripts/sync-gui-bridge-doc.sh"
+TMP_DIR=$(mktemp -d "${TMPDIR:-/tmp}/dce-bridge-sync-smoke.XXXXXX")
+DEST="$TMP_DIR/gui-zip/RECURRING-SCRAPE.md"
+
+cleanup() {
+  rm -rf "$TMP_DIR"
+}
+trap cleanup EXIT
+
+mkdir -p "$TMP_DIR/gui-zip"
+
+"$SYNC" --dest "$DEST"
+[[ -f "$DEST" ]] || { printf 'ERROR: dest missing\n' >&2; exit 1; }
+grep -q 'operator-handoff' "$DEST" || { printf 'ERROR: dest content unexpected\n' >&2; exit 1; }
+
+printf 'sync-gui-bridge-doc-smoke: ok\n'