GHSA-F8MP-VJ46-CQ8V OpenClaw's shell env fallback trusts unvalidated SHELL path from host environment

The shell environment fallback path could invoke an attacker-controlled shell when SHELL was inherited from an untrusted host environment. In affected builds, shell-env loading used $SHELL -l -c 'env -0' without validating that SHELL points to a trusted executable. In threat-model terms, this...