Stage create_grok_runtime_root into a sibling .next tree and swap only after
preflight so a failed install cannot wipe the live thin root. Re-apply the
ARCHIVE_PATH allowlist on the optional --execute-claude spawn path.
Fail closed on ARCHIVE_PATH allowlist when SPAWN_PATH is missing, require
non-empty monorepo root before runtime links, drop default --always-approve,
prefer --prompt-file for large Grok benchmark prompts, and make compat-audit
refuse theater-green when required bridge skills are absent.