test(uv): multi-version preference

[xangcastle]

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Changes are visible to end-users: yes/no

• Searched for relevant documentation and updated as needed: yes/no
• Breaking change (forces users to change their own code or config): yes/no
• Suggested release notes appear below: yes/no

Test plan

• Covered by existing test cases
• New test cases added
• Manual testing; please provide instructions so we can reproduce:

[aspect-workflows]

✨ Aspect Workflows Tasks

📅 Sat Jul 4 16:45:56 UTC 2026

✅ 7 successful tasks

• ✅ buildifier · ⏱ 24.6s · 🐙 GitHub Actions · ☑️ Check
  💬 Format complete (clean)
• ✅ gazelle · ⏱ 22.2s · 🐙 GitHub Actions · ☑️ Check
  💬 Gazelle complete (clean)
• ✅ test (test-e2e-bazel-8) · ⏱ 35m 44s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (63/63 passed)
• ✅ test (test-e2e-bazel-9) · ⏱ 32m 39s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (63/63 passed)
• ✅ test (test-examples-uv_pip_compile-bazel-8) · ⏱ 20.8s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (1/1 passed · 1 cached)
• ✅ test (test-root-bazel-8) · ⏱ 39m 29s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (123/123 passed)
• ✅ test (test-root-bazel-9) · ⏱ 35m 34s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (122/122 passed)

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