GHSA-j425-whc4-4jgc: OpenClaw's `system.run` env override filtering allowed dangerous helper-command pivots

system.run env override sanitization allowed dangerous override-only helper-command pivots to reach subprocesses. A caller who could invoke system.run with env overrides could bypass allowlist/approval intent by steering an allowlisted tool through helper-command or config-loading environment variables such as GIT_SSH_COMMAND, editor/pager hooks, and GIT_CONFIG_* / NPM_CONFIG_*.