refresh the published scripts and USAGE.md from the repo

scripts/test_probe_render_matches_action.py

@@ -29,6 +29,11 @@ from __future__ import annotations
 import sys
 from pathlib import Path
 
+# parents[2] is the REPO ROOT. `import twm.X` needs the directory that
+# CONTAINS the twm package, not the package itself -- inserting parents[1]
+# (twm/) leaves every `from twm.calib_epoch import ...` unresolvable, which
+# is why eight verifiers under this directory could not run at all.
+sys.path.insert(0, str(Path(__file__).resolve().parents[2]))
 sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
 
 import numpy as np                                              # noqa: E402