Codex: Global hooks - codex-install now writes to ~/.codex/hooks.json (global) by default. One install covers all projects.
Codex: Runtime isolation - Surgical guards prevent Claude Code settings writes under Codex while preserving dashboard/daemon/checkpoint operations.
Configurable tool-call thresholds - TOKEN_OPTIMIZER_TOOL_CALL_WARN and TOKEN_OPTIMIZER_TOOL_CALL_CRITICAL env vars. Defaults unchanged (25/40). Thanks to @CodyLee117 (#33).
Safe env-var parsing - All TOKEN_OPTIMIZER_* int/float configs warn on invalid values instead of crashing.
Fixes: Version alignment (was 5.6.7/5.6.8/5.6.9), install.sh sparse checkout, symlink guard on ~/.codex, dry-run no longer creates ~/.codex as a side effect.