fix(developer): improve .kmx output consistency for cross-platform

This fixes two issues:

1. `COMP_KEY` structure had padding that was not always zeroed out.
   Made this explicit.

2. Rule sorting could be inconsistent when re-sorting rules that
   use `+ any() > ...`, which are expanded at compile time into multiple
   rules, and which ended up with identical sort keys due to lack of
   precision. This relates to #8381 but only adds differentiation for
   the otherwise ambiguous rule sort keys, and does not fix that issue,
   which requires further investigation.