The hardcoded codex CLI version (0.104.0) causes upstream rejection when using gpt-5.5 with compact, as the server treats the request as an outdated client and returns 400/502. Update codexCLIVersion, codexCLIUserAgent, and openAICodexProbeVersion to 0.125.0 to match the current Codex CLI release. Fixes #1933, #1887, #1865 Related: #1609, #1298, #849