Keep vanetza-idf in obu-firmware, so a plain clone builds the firmware

obu-firmware builds against the vanetza-idf C-ITS library, which until now
came from the colleague's microbu-esp32c5 tree beside the repository and was
not tracked here, so a clone of this repository could not build the firmware
it ships. The library alone is now part of obu-firmware, as
obu-firmware/external/vanetza-idf: their external/vanetza-idf at commit
cf4b99f, unchanged (9775 files; see its PROVENANCE.md). CMake takes it from
there by default; -DVANETZA_IDF_DIR still points the build elsewhere.

The rest of the colleague's tree (their own VAM firmware, PKI tooling,
station-link Python tools, the V2X2MAP bridge) stays out of this repository
and gitignored; nothing is pushed to their repository. NOTES.md, docs/06,
TODO.md and the pcap verifier's usage line point at the new location.

obu-firmware/external/vanetza-idf/vanetza/security/v2/tests/check_region.hpp

@@ -0,0 +1,65 @@
+#ifndef CHECK_REGION_HPP_UFSV2RZ5
+#define CHECK_REGION_HPP_UFSV2RZ5
+
+#include <vanetza/security/v2/region.hpp>
+
+namespace vanetza
+{
+namespace security
+{
+namespace v2
+{
+
+/** \brief check two TwoDLocations
+ * \param expected the expected value
+ * \param actual the actual value
+ */
+void check(const TwoDLocation& expected, const TwoDLocation& actual);
+
+/** \brief check two ThreeDLocations
+ * \param expected the expected value
+ * \param actual the actual value
+ */
+void check(const ThreeDLocation&, const ThreeDLocation&);
+
+/** \brief check two CircularRegions
+ * \param expected the expected value
+ * \param actual the actual value
+ */
+void check(const CircularRegion& expected, const CircularRegion& actual);
+
+/** \brief check two RectangularRegions
+ * \param expected the expected value
+ * \param actual the actual value
+ */
+void check(const RectangularRegion& expected, const RectangularRegion& actual);
+
+/** \brief check two std::list<RectangularRegion>
+ * \param expected the expected list
+ * \param actual the actual value
+ */
+void check(std::list<RectangularRegion> expected, std::list<RectangularRegion> actual);
+
+/** \brief check two PolygonalRegions
+ * \param expected the expected value
+ * \param actual the actual value
+ */
+void check(PolygonalRegion expected, PolygonalRegion actual);
+
+/** \brief check two IdentifiedRegions
+ * \param expected the expected value
+ * \param actual the actual value
+ */
+void check(const IdentifiedRegion& expected, const IdentifiedRegion& actual);
+
+/** \brief check two GeographicRegion
+ * \param expected the expected value
+ * \param actual the actual value
+ */
+void check(const GeographicRegion& expected, const GeographicRegion& actual);
+
+} // namespace v2
+} // namespace security
+} // namespace vanetza
+
+#endif /* CHECK_REGION_HPP_UFSV2RZ5 */