Michael Bolin 2e8c3756f9 build: ratchet direct reqwest dependencies (#31431) ...

## Why

The `codex-http-client` migration now has a shared implementation and
several migrated request paths, but nothing prevents a new crate from
adding another direct `reqwest` dependency while the remaining call
sites are being converted. The dependency graph should both enforce the
direction of travel and make the remaining scope visible.

This PR adds that ratchet on top of #31363. It does not claim the
migration is complete: the allowlist deliberately records all 18
first-party crates that still depend on `reqwest` directly.

## What changed

- Ban `reqwest` with cargo-deny unless its immediate parent is an
explicitly listed wrapper.
- Identify `codex-http-client` as the intended owner.
- Record the 18 current first-party direct dependents as temporary
migration exceptions.
- Separately allow six third-party integrations that own their `reqwest`
dependency: `oauth2`, `opentelemetry-http`, `opentelemetry-otlp`,
`rmcp`, `sentry`, and `webrtc-sys-build`.
- Cover both `reqwest` 0.12 and 0.13 with the same package-level rule.

## Migration rule

A new first-party crate cannot add `reqwest`. When a listed crate
finishes migrating, its direct Cargo dependency and its wrapper entry
should be removed in the same PR, so the first-party list can only
shrink.

## Review guide

The entire change is the new `reqwest` entry in `codex-rs/deny.toml`:

1. `codex-http-client` is the permanent intended wrapper.
2. The next 18 entries are the first-party migration backlog.
3. The final six entries are separately documented third-party parents
required by cargo-deny graph semantics.

## Validation

- `cargo deny check bans --hide-inclusion-graph` (`bans ok`; existing
duplicate-version warnings remain warnings)




























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[//]: # (BEGIN SAPLING FOOTER)
Stack created with [Sapling](https://sapling-scm.com). Best reviewed
with [ReviewStack](https://reviewstack.dev/openai/codex/pull/31431).
* #31837
* #31828
* #31825
* #31821
* #31637
* __->__ #31431

2026-07-09 11:53:18 -07:00

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