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afbd9361a7
combo.ts's isContextOverflow400() guard required the literal word
'context' in the 400 error body before letting a combo fall through to
the next target. Kimi's exact wording ('Your request exceeded model
token limit: 262144 (requested: 308458)') never says 'context', so the
guard misclassified it as a body-specific error and halted the whole
combo instead of trying the next (larger-context) target.
accountFallback.ts's CONTEXT_OVERFLOW_PATTERNS already recognized this
wording one layer below (via checkFallbackError -> shouldFallback), so
the two independently-maintained classifiers disagreed and the
stricter one won. Export CONTEXT_OVERFLOW_PATTERNS from
accountFallback.ts and reuse it inside combo.ts's
isContextOverflow400() so both layers share a single source of truth.
Regression test: tests/unit/repro-6637-kimi-token-limit.test.ts
(RED on unfixed code -> GREEN after the fix). Existing #4519 guard
tests (tests/unit/combo-param-validation-fallback-4519.test.ts) still
pass, including the negative case that a genuinely body-specific 400
is NOT misclassified as overflow.