PyneCore v6.4.4 — correctness fixes

May 4, 2026

Partial take-profit exits no longer silently collide (multi-TP strategies)
strategy.cancel() aligned with TV semantics
request.security() safety: locked shared memory, strategy-state guards, tuple-unpack defaults
ta.variance / stdev / bb / kc rewritten with Welford/Pébay (no more long-run drift)
array.new_box/line/label/linefill return properly typed arrays

Thanks to <@739903666995068978> for the detailed bug reports that drove several of these fixes.