Share Guardian user-message retention logic - #42031
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## What changed - Add a shared `select_user_messages` helper in `guardian-context` that always anchors the first user message and fills the remaining token budget from newest to oldest. - Use the helper for both core Guardian prompt rendering and the Guardian V2 async scorer so they apply the same retention policy. ## Testing - Cover empty and single-message transcripts, over-budget anchors, and newest-first selection across multiple token budgets. GitOrigin-RevId: 7db246013875263ceb5806d2a6a19b4e2a3db1c4
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Share Guardian user-message retention logic
What changed
select_user_messageshelper inguardian-contextthat alwaysanchors the first user message and fills the remaining token budget from
newest to oldest.
async scorer so they apply the same retention policy.
Testing
newest-first selection across multiple token budgets.