Pin the native call sequences, their order and the <name>Change timing that the
native-update rework has to keep, plus a hot-path timing probe for I6.

The six copies of the suspend-or-apply block now share one routing helper, and the
native default capture exists in one place instead of eight.

A resume now builds a batch of everything dirty on the node and hands it to
commitNativeUpdates, which a class can override to order its own native writes.

batch()/begin()/end() coalesce the writes made to each node into one commit, and
flushNativeUpdates pushes what is pending, optionally past the loaded hold.

A property can name aggregate invalidations it raises; the node's commit runs each
one's handler once, after the properties, however many of them raised it.

A node using the default commit hook with no aggregate invalidations pending cannot
reach the batch, so the commit sweeps the dirty set directly instead of building one.