Add dynamic-array unique() and unique_index() support and extend queue/darray min() and max() to accept locator with(...) predicates. Generate dedicated _with sfuns for min/max, emit VVP code for filtered scans, and reduce through new object-stack min/max opcodes.
Cover the new behavior with ivtest regressions for darray unique and queue/darray min/max with predicates, and update locator method documentation.
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