Add upstream commits since the tag to the -hz build identifier

Builds on newer upstream code kept the same -hz.N label because N counted
only local commits, so KM-Test's v1.18.0.2-hz.1 and the CI release of a
later upstream were indistinguishable. The identifier is now -hz.U.L: U
upstream commits past the version tag, L local firmware-code commits.

local_build.sh

@@ -68,9 +68,12 @@ cd "$(dirname "$0")"
 # VERSION follows the fork's own numbering: the highest vX.Y.Z.W tag reachable
 # from HEAD (e.g. v1.17.1.10 from rak4631-full-companion-v1.17.1.10-preview3).
 # Local code changes add an identifier; build settings (untracked files) don't:
-#   -hz.N   N of your own commits that change firmware code relative to the
-#           maintainer's fork (upstream/keymindCascade; origin is the personal
-#           Gitea copy, so @{upstream} would hide them)
+#   -hz.U.L U upstream commits past the vX.Y.Z.W tag(s) in the maintainer's fork
+#           (upstream/keymindCascade; origin is the personal Gitea copy, so
+#           @{upstream} would hide them) and L of your own commits that change
+#           firmware code. U grows with every upstream pull, so builds on newer
+#           upstream code sort higher even when the tag and L are unchanged.
+#           LoRa OTA sees only vX.Y.Z.W; compare U.L to decide an upgrade.
 #   .dirty  uncommitted edits to tracked firmware code
 # Merge commits and the build-setup files below don't count: they change
 # settings, not code. Edit LOCAL_FW_SETUP_PATHS if you add more setup files.
@@ -90,8 +93,13 @@ LOCAL_FW_SETUP_PATHS=":(exclude)local_build.sh :(exclude)local_version.py :(excl
 # shellcheck disable=SC2086  # intentional word-splitting of the pathspec list
 local_commits=$(git rev-list --count --no-merges "${LOCAL_FW_UPSTREAM_REF}..HEAD" \
   -- . $LOCAL_FW_SETUP_PATHS 2>/dev/null || echo 0)
-if [ "$local_commits" -gt 0 ]; then
-  local_id="-hz.${local_commits}"
+# Every tag carrying this version is excluded, so U counts from the newest of them.
+upstream_base=$(git merge-base HEAD "${LOCAL_FW_UPSTREAM_REF}" 2>/dev/null || git rev-parse HEAD)
+# shellcheck disable=SC2046  # one ^tag argument per tag
+upstream_commits=$(git rev-list --count "$upstream_base" \
+  $(git tag --merged "$upstream_base" | grep -F "v${fork_version}" | sed 's/^/^/') 2>/dev/null || echo 0)
+if [ "$upstream_commits" -gt 0 ] || [ "$local_commits" -gt 0 ]; then
+  local_id="-hz.${upstream_commits}.${local_commits}"
 fi
 # shellcheck disable=SC2086
 if [ -n "$(git status --porcelain --untracked-files=no -- . $LOCAL_FW_SETUP_PATHS)" ]; then

local_version.py

@@ -4,7 +4,7 @@
 #
 #   repeater/room/sensor: hazelwood_repeater v1.17.1.10 (core v1.17.1)
 #   companion:            v1.17.1.10 hazelwood (core v1.17.1)
-#   with local code changes the version gains -hz.N and/or .dirty (local_build.sh)
+#   past the tag the version gains -hz.U.L and/or .dirty (local_build.sh)
 #
 # Companions keep the version first because the app's device-info frame
 # carries only the first 19 characters (companion MyMesh.cpp strzcpy(..., 20)).