fix(e2e): correct return type of _stub_with_token

[mesutoezdil]

_stub_with_token returns a tuple[OpenShellStub, list[tuple[str, str]]]
but was annotated as OpenShellStub.
This caused 31 mypy errors cascading to every call site.
1-line fix to match the actual return value.

[copy-pr-bot]

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[TaylorMutch]

/ok to test f337b7e

[johntmyers]

gator-agent

Maintainer Approval Needed

Gator validation and PR monitoring are complete.

Validation: This is a small, concentrated E2E typing fix that matches _stub_with_token's actual return shape.
Review: Independent code review found no blocking correctness, security, maintainability, or missing-test issues at head f337b7ec37873b1df2d9cc414712ecd83696a67a.
Docs: Not needed; this does not change user-facing behavior or Fern-documented UX.
Checks: Required branch, DCO, Python, Rust, license, markdown, lockfile, and Helm gate statuses are passing.
E2E: No test:* label is required for this test-only annotation fix; E2E/GPU gate statuses are passing with those suites not applied.

Human maintainer approval or merge decision is now required.

[johntmyers]

gator-agent

Monitoring Complete

Monitoring is complete because this PR has merged.

Final status: PR #1897 was in gator:approval-needed; maintainer approval was recorded, required gate statuses were passing, and the PR merged at 2026-06-13T21:21:00Z.

I removed the active gator:* label because there is nothing left for gator to monitor on this PR.