The while/do-while loop cap guard 'not isinstance(max_iters, int) or
max_iters < 1' does not fall back to the default for a boolean
max_iterations: isinstance(True, int) is True and True < 1 is False. The
loop then runs range(max_iters - 1) == range(True - 1) == range(0),
capping at a single iteration instead of the default 10. Exclude bools,
mirroring the merged while/do-while validators (#3237) and this
function's own continue_on_error bool handling. execute() does not
auto-validate, so this engine guard is the only defence.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
9d96c62901