[codex] Add retired model compaction repro#30319
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Summary
codex-coreintegration test for model-switch pre-sampling compactionWhy
Sentry issue
CODEX-2F3Yshowed an existing ChatGPT-authenticated thread continuing to sendgpt-5.6-oaifromrun_pre_sampling_compactafter the user selectedgpt-5.6-sol-oai. The failure occurs when a compaction hash change causes the migration compaction path to reconstruct the previous model context.This draft adds a regression reproduction only; it does not change runtime behavior.
Validation
just fmtjust test -p codex-core pre_sampling_compact_uses_retired_previous_model_after_rename