feat: catalogue-publish action

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

catalogue-publish/version-code.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+# Derive a version code from strict semver MAJOR.MINOR.PATCH (each 0-999):
+# MAJOR*1000000 + MINOR*1000 + PATCH. Anything else exits 1.
+set -eu
+v="${1:-}"
+if [[ "$v" =~ ^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$ ]]; then
+  echo $(( 10#${BASH_REMATCH[1]} * 1000000 + 10#${BASH_REMATCH[2]} * 1000 + 10#${BASH_REMATCH[3]} ))
+else
+  echo "error: version '$v' is not MAJOR.MINOR.PATCH with components < 1000; pass version-code explicitly" >&2
+  exit 1
+fi