fix(cli): ignore floating major tags when resolving latest version

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+### Fixed
+- `bashunit upgrade` resolved the floating `v0` Action tag as the latest version, breaking upgrades; it now only considers exact-version tags
+
 ## [0.39.0](https://github.com/TypedDevs/bashunit/compare/0.38.0...0.39.0) - 2026-06-09
 
 ### Added

src/helpers.sh

@@ -322,10 +322,12 @@ function bashunit::helper::get_latest_tag() {
     return 1
   fi
 
+  # Floating major tags (e.g. v0) are not releases and must not win
   git ls-remote --tags "$BASHUNIT_GIT_REPO" |
     awk '{print $2}' |
     sed 's|^refs/tags/||' |
     grep -v '\^{}' |
+    grep -E '^[0-9]+\.[0-9]+(\.[0-9]+)?$' |
     sort -Vr |
     head -n 1
 }

tests/unit/helpers_test.sh

@@ -292,6 +292,17 @@ EOF
   unset -f git # remove the mock
 }
 
+function test_get_latest_tag_ignores_floating_major_tags() {
+  bashunit::mock git <<EOF
+fc9aac40eb8e5ad4483f08d79eb678a3650dcf78        refs/tags/0.38.0
+3977be123b0b73cfdf4b4eff46b909f37aa83b3c        refs/tags/0.39.0
+9bb3726a1bf83fb09ca548a398762ab89baaa9b6        refs/tags/v0
+b546c693198870dd75d1a102b94f4ddad6f4f3ea        refs/tags/v0^{}
+EOF
+  assert_same "0.39.0" "$(bashunit::helper::get_latest_tag)"
+  unset -f git # remove the mock
+}
+
 function test_to_run_with_filter_matching_string_in_function_name() {
   local functions
   functions=("test_my_awesome_function" "test_your_awesome_function" "test_so_lala_function")