- Fixes cumulative update-package generation across compatibility-line changes such as 0.4.x → 0.5.x.
- Preserves every explicitly declared compatible source version from release/skymission-manifest.json when building the immutable ZIP instead of replacing the list with only same-line changelog versions.
- Restores direct update eligibility from 0.4.2.18-beta and the earlier supported 0.4.x releases to the 0.5 release line.
- Adds a regression validator so future major/compatibility-line releases cannot silently lose older supported source versions during packaging.
SKYMISSION BETA 0.5.1.2