nx_badimport_probe.nx

nx_badimport_probe.nx -- FAIL-OPEN PROBE for seq650: an UNRESOLVED import must be a LOUD ERROR. Imports resolve DIRECTORY-LOCAL, and the reported defect is that nx_cc emits an EMPTY elf on an unresolved import instead of hard-erroring -- so three real organs (nx_dataeng_compare_page, nx_site_archetype, nx_site_build) "built successfully" and produced nothing. HOW TO READ THIS PROBE: it is the one probe that PASSES BY FAILING TO BUILD. A loud build failure naming the missing module is the CORRECT outcome. A "BUILT" line -- especially one with a 0-byte or tiny artifact -- is the defect reproducing. Never "fix" this file's import.