## Why
MXC's native host-loopback access is bidirectional, so it cannot enforce `allow_local_binding = false`. Treating an omitted setting as `false` prevents managed networking from working with the default configuration.
## What changed
- Preserve an omitted `allow_local_binding` until the executor's sandbox policy is known. Default to `true` for Windows MXC and `false` elsewhere, including remote execution.
- Reject an effective `false` for MXC managed networking after applying policy restrictions, without enabling disabled networking.
- Use the executor's resolved value for remote network approval decisions while preserving explicit controller restrictions.
- Document that local binding permits local servers and direct host-loopback connections and skips additional private-network destination checks; proxy domain rules still apply.
## Testing
Add coverage for per-executor defaults, explicit values, MXC rejection of `false`, and remote network review cleanup with the resolved policy.
GitOrigin-RevId: 0fa7c1eaec68bebada2b8f7af45688315eea70a9
## Why
The default resolver misses macOS supplemental resolvers and VPN split DNS, preventing Codex from reaching hosts that depend on those DNS settings.
## What changed
Use `tokio::net::lookup_host` for IPv4 and IPv6 lookups in the macOS TCP connector, including connections to upstream proxies. Preserve existing checks on resolved destination addresses and reject unsupported TXT lookups without falling back to a different resolver.
## Testing
Add macOS tests for IPv4 and IPv6 localhost resolution and connections, local-network rejection, and resolving the upstream proxy instead of the destination.
GitOrigin-RevId: 3c7fc4f8b309e26b02923d8fafd4e1f1e1f7755f
iceweasel-oai