Per-zone play params on SampleData; hand-rolled pure pitch_shift OLA for Preserve (WDL drags
windows.h); zone-payload v3 tail; RT-safe pre-warmed shifters + Preserve voice cap.
Extension stamps a monotonic bank_generation counter, bumped at content
mutations; the VST3 instrument polls it off-thread on an editor timer and
consumes assignment requests, refreshing playback hands-free.
Zone editor in the IPlugView LICE surface, zoned resolution built off-thread into the
LoadedInstrument keymap with Tier-0 fallback, performance map in VST3 component state
with v1 back-compat. Pure resolve/build/serialize + geometry with CTest coverage.
Tag LoadedInstrument with installedAt; process() publishes that field (not a re-read
of reloadGeneration_) so the pruner's displacedAt <= seen bound is airtight. Also fixes
sampleRowHitTest canvas.bottom over-read and adds interleave-stride + canvas-clip tests.