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Filters whether to short-circuit ability execution.

Returning a value other than the received default bypasses the rest of `execute()` — input normalization, input validation, permission checks, the registered execute callback, output validation, and the surrounding actions — and the value is returned to the caller as-is. Useful for cached responses, rate limiting, maintenance mode, and test mocking. To continue with normal execution, return `$pre` unchanged. This preserves any value (including `null`, `false`, or arbitrary objects) as a valid short-circuit result. Because validation is bypassed, callers that short-circuit are responsible for the integrity of any value they consume from `$input`.