Merged. The failure mode was concrete — a matched reasoning rule dropped on native Responses/Anthropic paths, model-suffix/account defaults, or fallback preparation, and `_omnirouteReasoningRule` leaking upstream as `Unsupported parameter` — and the fix is carried in the request-local credential context through dispatch, refreshed credentials and fallbacks, with forced effort winning over defaults and client-forged markers dropped at ingress. The 11-case integration suite exercises the real routing/translation modules.
Validated as a combined board first (this PR merged with the 4 siblings of the JxnLexn wave on the release tip): eslint with the frozen suppressions, typecheck:core, check:open-sse-typecheck, complexity, cognitive-complexity, changelog-integrity, docs-sync, migration-numbering, provider-consistency and a duplicate-identifier audit all green, plus 77 passing / 0 failing focused node:test cases across the test files the wave touches. The wave's i18n fill (new keys carried to all 66 locales), free-tier doc counts and file-size rebaseline land in one follow-up PR right after the wave, as with #13904.
Thank you — and for keeping this a runtime-only change with the editor and service-tier work in their own PRs.
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