fix(core): correct Codex OAuth context limit - #343
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Summary
Root cause
The OpenAI catalog describes the public Responses API limits. The ChatGPT OAuth route reused those values unchanged even though the Codex backend advertises a 272k context window, causing compaction to occur too late.
Validation
bun test test/plugin/provider-openai.test.ts test/session-runner-model.test.tsbun typecheckfrompackages/core