docs(changeset): record measure() pendingMin and iOS flush accumulator fixes

Author: tannerlinsley

.changeset/fix-core-measure-and-ios-flush.md

@@ -0,0 +1,13 @@
+---
+'@tanstack/virtual-core': patch
+---
+
+Two correctness fixes in the new code:
+
+- `measure()` now resets `pendingMin` so a prior `resizeItem()` that left
+  it non-null can't preserve stale `measurementsCache` entries before that
+  index. The next rebuild is guaranteed to start at 0.
+- The iOS deferred-adjustment flush now rolls its accumulated delta into
+  `scrollAdjustments`. Without this, a resize landing between the flush
+  and the resulting scroll event would compute the next correction from
+  the stale pre-flush offset.