Codex CLI 0.156.0-alpha.5

• [new] Gateway OAuth login support, including callback handling and stored token management for authenticating through a gateway.
• [new] Multi-agent tool support so sessions can coordinate work across agents.
• [new] Feedback configuration support for controlling how feedback-related settings are loaded.
• [new] Combined auth handling in the model-provider layer for unified credential use across providers.
• [changed] TUI tool-output handling improved for clearer presentation of tool results in the terminal UI.
• [changed] Hook handler metadata expanded to distinguish agent, command, MCP tool, and prompt handlers more explicitly.
• [changed] Login account parameters refined, including ChatGPT and Amazon Bedrock access-key flows.
• [changed] Remote client eventing updated: remote ack replaces the previous remote client-message chunk event.
• [removed] Workspace routing removed from the model-provider path in favor of the newer auth/provider setup.
• [changed] Model provider info and related API payloads refreshed (tokens, marketplace/manifest pieces, and other typed responses).

Under the hood

• New gateway OAuth configuration and token response types, with delivery options such as cookie and header-based auth.
• Analytics and related TOML config shapes added for structured settings.
• Environment hooks for exec-server and sandbox behavior, including a sandbox network-disabled switch and daemon telemetry handoff wiring.
• Assorted error, turn-input, and tool-summary enum cleanups aligned with the multi-agent and remote-ack work.
• Workspace crate lockfile and alpha version metadata bumped to 0.156.0-alpha.5.