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host-call-fn: the K.callFn path had no try-catch, so SX exceptions from behavior handlers (compiled via K.callFn) propagated through SX guard frames as JS errors. Add try-catch that swallows non-TIMEOUT errors and re-throws TIMEOUT (matching the fn.apply path). _SLOW_DEADLINE_SUITES: behavior tests legitimately take 10-20s per test (behavior script compilation + install + init). Extend their deadline from the default 10s to 20s so they pass rather than wall-clock timeout. Net: hs-upstream-behavior 10/10 (+5 previously timing out). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>