## Summary
Adds the standard Codex `User-Agent` to shared default headers so the
responses-api WS handshake carries the same client OS and version
context as HTTP requests.
## Testing
- `cargo test -p codex-core
build_ws_client_metadata_includes_window_lineage_and_turn_metadata`
- `cargo test -p codex-core --test all responses_websocket`
## Summary
- Adds a process-local, in-memory cookie store for ChatGPT HTTP clients.
- Limits cookie storage and replay to a shared ChatGPT host allowlist.
- Wires the shared store into the default Codex reqwest client and
backend client.
- Shares the ChatGPT host allowlist with remote-control URL validation
to avoid drift.
- Enables reqwest cookie support and updates lockfiles.
- Move the auth implementation and token data into codex-login.
- Keep codex-core re-exporting that surface from codex-login for
existing callers.
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Co-authored-by: Codex <noreply@openai.com>
Khoi