0.91.0

Chores

• Reduced the maximum allowed number of sub-agents to 6 to tighten resource usage and guardrails in agent fan-out behavior (#9861)

Changelog

Full Changelog: https://github.com/openai/codex/compare/rust-v0.90.0...rust-v0.91.0

• #9861 chore: half max number of sub-agents @jif-oai