fix(codex): account models use the gpt-6-astra default the turn runs with

The ChatGPT-account fallback built its reasoning control from the catalog
default, while turns without a saved effort use the astra override from
main, so the picker showed Low and the turn ran at Medium.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
dde935ccdcJulius Marminge committed on 10/20/2026, 5:37:04 AMparentd9f6454

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