GitLab workflow models are not discovered in v2 #50421

Description

GitLab Duo Agent Platform models are missing from the v2 model picker, although workflow discovery works in v1 for the same project.

The v1 GitLab loader calls gitlab-ai-provider.discoverWorkflowModels() and registers the returned models. The v2 adapter in packages/core/src/plugin/provider/gitlab.ts only registers SDK/language hooks; it never calls discovery. Updating the SDK alone does not restore that integration.

This is a missing v2 integration, distinct from the token-passing problem reported in #37107.

Plugins

Reproduced with no external plugins and a fresh credential store using GITLAB_TOKEN.

OpenCode version

v2 source checkout (2.0.11; discovery code is also unchanged in 2.0.12)

Steps to reproduce

1. Export a valid GITLAB_TOKEN with Duo Agent Platform access.
2. Start a fresh v2 server with an isolated credential store, then open a GitLab project using bun run dev --standalone /path/to/project.
3. Open the model picker: chat models appear, but no discovered duo-workflow-* models.
4. Call the SDK discovery API directly with the same token and directory: it returns the available workflow models.

With the discovery call restored, a live test against gitlab-org/gitlab returned 54 workflow models through both the v2 model API and CLI.

Operating System

macOS (arm64)

Terminal

zsh / Bun 1.4.2