Add versionCode regression guard to set-version.sh

Before stamping the manifest, the script now compares the computed
versionCode against the previous release tag's versionCode and fails
if it hasn't increased. This prevents silent version regressions like
the v0.9.3 release where versionCode was never bumped from v0.9.2.

Author: bpmct

tools/set-version.sh

@@ -35,6 +35,21 @@ if [[ ! -f "${MANIFEST}" ]]; then
   exit 1
 fi
 
+# Guard: ensure new versionCode is strictly higher than the previous release tag
+PREV_TAG="$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || true)"
+if [[ -n "${PREV_TAG}" ]]; then
+  PREV_CODE="$(git show "${PREV_TAG}:${MANIFEST}" 2>/dev/null \
+    | sed -n 's/.*android:versionCode="\([0-9]*\)".*/\1/p' || true)"
+  if [[ -n "${PREV_CODE}" && "${VERSION_CODE}" -le "${PREV_CODE}" ]]; then
+    echo "error: new versionCode ${VERSION_CODE} is not higher than previous tag ${PREV_TAG} (versionCode=${PREV_CODE})" >&2
+    echo "hint: this usually means the tag version was not bumped correctly" >&2
+    exit 1
+  fi
+  if [[ -n "${PREV_CODE}" ]]; then
+    echo "versionCode check passed: ${VERSION_CODE} > ${PREV_CODE} (${PREV_TAG})"
+  fi
+fi
+
 python3 - <<PY
 import re
 from pathlib import Path