fix(uv): resolve extra-only markers during graph activation and treat them as venv-resolved in selects

[xangcastle]

This fix handles PEP 508 markers that reference the extra variable by recognizing they are not Bazel execution-environment conditions: during dependency-graph activation, real extra markers such as extra == 'build' are partially evaluated against the active extra so they collapse to unconditional or platform-only expressions, while any marker that depends solely on extra—including uv's internal conflict-routing markers—is treated as already resolved by the active dependency-group/venv and rendered as a //conditions:default arm in the generated aliases instead of an un-evaluable decide_marker select, preventing analysis failures when the venv name does not match the extra.

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• 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

📅 Wed Jul 8 04:21:10 UTC 2026

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• ✅ test (test-e2e-bazel-8) · ⏱ 35m 1s · 🐙 GitHub Actions · ☑️ Check
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• ✅ test (test-e2e-bazel-9) · ⏱ 33m 47s · 🐙 GitHub Actions · ☑️ Check
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• ✅ test (test-root-bazel-9) · ⏱ 37m 58s · 🐙 GitHub Actions · ☑️ Check
  💬 Bazel test complete (125/125 passed)

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[jbedard]

Same for main?

[xangcastle]

yes, same for main #1279