Operational rules for driving Codex CLI from scripts: success-signal contract, diff-feeding semantics, worktree -C flag, and stdin vs argv. Triggers when invoking `codex exec` programmatically (not interactively) — script wrappers, ralph loops, cron pipelines, multi-CLI fan-out. Surfaces silent fail
Operational rules for driving Codex CLI from scripts: success-signal contract, diff-feeding semantics, worktree -C flag, and stdin vs argv. Triggers when invoking `codex exec` programmatically (not interactively) — script wrappers, ralph loops, cron pipelines, multi-CLI fan-out. Surfaces silent failure modes that exit 0 but produce no useful output. Triggers (English): codex exec, codex cli, codex