dita_v2(test): enforce post-ack atomicity and suite integrity

prod/clean_arch/dita_v2/conftest.py

@@ -0,0 +1,10 @@
+"""DITAv2 pytest collection policy.
+
+The files below are source generators or frozen backups, not executable tests.
+Both ``_gen_test.py`` paths match pytest's default ``*_test.py`` pattern and
+perform file generation at import time, so collecting them corrupts the test
+boundary and can fail before the real suite loads.
+"""
+
+collect_ignore = ["_gen_test.py"]
+collect_ignore_glob = ["_backup_20260530/*"]