Adds Codex as a selectable hosted web-search provider, routes native Codex search safely across model overrides, and isolates bounded hosted-search workers from configured tools.\n\nVerification: focused post-merge regression suite passed 202/202 tests on exact head 23824af49a.
Route implicit OpenAI image understanding through the Codex app-server for eligible OpenAI OAuth profiles. Preserve scoped and persisted credential ownership plus the rotating-token refresh lifecycle for isolated clients.
Fixes#87168
Thanks @bek91.
Harden the Codex app-server native execution bridge for OpenClaw sandboxed runs. The change keeps core sandbox policy in OpenClaw while exposing the process, filesystem, and HTTP relay behavior Codex needs inside a scoped exec server.
The large exec-server/test files were split into focused modules before landing, and the PR was rebased onto current main with focused tests, Testbox changed checks, CI, and Codex autoreview green.
Co-authored-by: joshavant <830519+joshavant@users.noreply.github.com>
