build: Packages/ directory with 91 pkgar files + auto-sync script

Packages/ is the canonical binary package repository for Red Bear OS.
Contains stage.pkgar copies of all built packages (91 files).

New scripts:
- local/scripts/sync-packages.sh: syncs built pkgar → Packages/
- make packages-sync: run sync
- make packages-list: list package count

Future: cache-auto will auto-sync to Packages/ after each build.

local/scripts/sync-packages.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+# Red Bear OS — Package Repository Sync
+# Copies all built stage.pkgar files to Packages/ directory.
+# This is the canonical binary package repository for Red Bear OS.
+#
+# Usage:
+#   ./local/scripts/sync-packages.sh           Sync all built packages
+#   ./local/scripts/sync-packages.sh --verify   Verify package integrity
+set -euo pipefail
+cd "$(dirname "$0")/../.."
+
+PKG_DIR="Packages"
+mkdir -p "${PKG_DIR}"
+
+if [ "${1:-}" = "--verify" ]; then
+    echo "=== Package Integrity Check ==="
+    ok=0; bad=0
+    for pkgar in "${PKG_DIR}"/*.pkgar; do
+        [ -f "$pkgar" ] || continue
+        pkg=$(basename "$pkgar" .pkgar)
+        if [ -s "$pkgar" ]; then
+            ok=$((ok+1))
+        else
+            echo "  EMPTY: $pkg"
+            bad=$((bad+1))
+        fi
+    done
+    echo "Valid: $ok, Empty: $bad"
+    exit $bad
+fi
+
+echo "=== Syncing Packages ==="
+count=0
+while IFS= read -r pkgar; do
+    pkg_path=$(dirname "$(dirname "$(dirname "$pkgar")")")
+    pkg=$(basename "$pkg_path")
+    dest="${PKG_DIR}/${pkg}.pkgar"
+    if [ ! -f "$dest" ] || [ "$pkgar" -nt "$dest" ]; then
+        cp "$pkgar" "$dest" && count=$((count+1))
+    fi
+done < <(find recipes local/recipes -name "stage.pkgar" -path "*/target/x86_64-unknown-redox/*" 2>/dev/null)
+
+echo "Synced $count packages to ${PKG_DIR}/"
+echo "Total: $(ls ${PKG_DIR}/*.pkgar 2>/dev/null | wc -l) pkgar files"