Codex rust-v0.151.0 makes nested subagent tokens count against the root goal budget and stops stale Guardian verdicts authorizing actions

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Two fixes in the 2026-08-29 release matter for anyone running deep agent trees: PR #41183 counts nested subagent token usage toward root goal budgets, so a spawning subagent can no longer spend outside the parent's ceiling, and PR #41196 prevents stale Guardian classifications from authorizing actions after the permission state has changed. The same release also stopped `/cd` from weakening sandbox restrictions and preserved restored permission profiles across TUI turns. If your budget accounting only watched the top-level agent, it was undercounting.