* fix(tests): retire claude-3-5-sonnet-20241022 from the combo integration suites
Sibling of #12670. Eight integration suites still targeted the retired claude-3-5-sonnet-20241022, which the vendor lifecycle registry rejects with HTTP 410, so every combo listing it lost that target: 23 cases failed on the release tip for one cause. Replace it with claude-sonnet-4-6, the successor the lifecycle record names and the id chat-pipeline.test.ts already uses. Fixture model id only; no assertion changed, no production code touched.
* docs(changelog): fragment for the retired-fixture cleanup (#13056)
Release v3.8.24 — see CHANGELOG.md [3.8.24] for the full notes and the PR description for the contributors hall. Integration of release/v3.8.24 into main.
