Web sessions don't pull submodules even when both repos are granted access

Description

When deploying a task to a Claude Code web session on a repo that contains a git submodule, the session fails to fetch the submodule — even though I've explicitly granted the Claude Code GitHub app access to both the parent repo and the submodule repo.

Repro

1. Parent repo contains a git submodule pointing at another repo
2. Grant the Claude Code GitHub app access to both the parent and the submodule repo
3. Deploy a task on the parent repo via Claude Code web
4. Session starts on the parent repo but the submodule path is empty

Expected

Submodule is checked out at the pinned commit, equivalent to git clone --recurse-submodules or git submodule update --init --recursive after clone.

Actual

Submodule path is empty / unfetched. Any task that touches code inside the submodule fails because the files aren't there.

Notes

• Both repos are private, both granted access via the GitHub app integration
• Works fine locally with the same credentials