chore: remove nanoclaw legacy skills and scripts

Remove 9 inherited skills (Qodo, update-ejclaw, add-* addons,
update-skills) and restart-ejclaw-stack.sh that came from the
nanoclaw fork and are no longer used.

scripts/restart-ejclaw-stack.sh

@@ -1,8 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-PROJECT_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
-
-cd "${PROJECT_ROOT}"
-bun setup/restart-stack.ts "$@"