fix: files seed for large tests

scripts/files/seed-1gb.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SIZE_MB=${SIZE_MB:-1024}
+ROOT=${ROOT:-./test-files}
+TARGETS=${TARGETS:-archive snapshot sync}
+
+bytes() { echo $(( SIZE_MB * $1 / 100 * 1024 * 1024 )); }
+
+random_file() {
+  mkdir -p "$(dirname "$1")"
+  head -c "$2" /dev/urandom > "$1"
+}
+
+random_tree() {
+  mkdir -p "$1"
+  head -c "$2" /dev/urandom | split -b "$3" -a 4 -d - "$1/part-"
+}
+
+text_file() {
+  mkdir -p "$(dirname "$1")"
+  head -c "$2" < <(base64 -w 76 /dev/urandom) > "$1"
+}
+
+log_file() {
+  mkdir -p "$(dirname "$1")"
+  head -c "$2" < <(yes "2026-10-18T12:00:00Z INFO GET /api/backups 200 12ms") > "$1"
+}
+
+seed() {
+  local dir=$1
+  rm -rf "$dir"/{media,projects,docs,logs,cache,build,scratch} "$dir/latest.bin"
+  mkdir -p "$dir"
+
+  for i in 1 2 3 4 5 6; do
+    random_file "$dir/media/video-$i.bin" "$(bytes 10)"
+  done
+  for i in $(seq -w 1 20); do
+    random_tree "$dir/projects/p$i/src" "$(bytes 1)" 128K
+  done
+  for i in 1 2 3 4; do
+    text_file "$dir/docs/report-$i.txt" "$(bytes 2)"
+  done
+  log_file "$dir/logs/app.log" "$(bytes 4)"
+  random_tree "$dir/projects/p01/node_modules/pkg" "$(bytes 4)" 32K
+  random_tree "$dir/cache" "$(bytes 2)" 1M
+  random_tree "$dir/build" "$(bytes 1)" 1M
+  random_file "$dir/scratch/session.tmp" "$(bytes 1)"
+  ln -s media/video-1.bin "$dir/latest.bin"
+
+  echo "$dir: $(du -sh "$dir" | cut -f1), $(find "$dir" -type f | wc -l) files"
+}
+
+for target in $TARGETS; do
+  seed "${ROOT:?}/$target"
+done