feat: treat dashed upstream version as equivalent to packaged underscore form

SlackBuild versions cannot contain '-' (it breaks PRGNAM parsing), so an
upstream date like 2026-06-02 is packaged as 2026_06_02. mkhint was
comparing them byte-for-byte and offering a spurious upgrade/downgrade.

Add _normalize_version ('-' -> '_') and apply it to the upstream version
in --check and --hintfile (no -v) before comparing and before storing, so
equivalent versions compare equal and accepted updates are written in the
underscore form. nvtake still uses nvchecker's raw keyfile value.

Tests T48/T49 cover equivalence and normalized storage (105 passing).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

0 files changed, 0 insertions, 0 deletions