fix(checkpoints): import shared helpers by location

dist/claude-code/structured-coding/scripts/checkpoints.py

@@ -12,6 +12,10 @@
 
 # Installed helpers must not create files in the published skill tree.
 sys.dont_write_bytecode = True
+# Import by location rather than relying on sys.path[0], which is absent under
+# python3 -P. This import is above main()'s try, so failing here would exit
+# non-zero without the empty result a hook must always return.
+sys.path.insert(0, str(Path(__file__).resolve().parent))
 from continuity import (  # noqa: E402
     HOSTS,
     MAX_INPUT,

dist/codex/structured-coding/scripts/checkpoints.py

@@ -12,6 +12,10 @@
 
 # Installed helpers must not create files in the published skill tree.
 sys.dont_write_bytecode = True
+# Import by location rather than relying on sys.path[0], which is absent under
+# python3 -P. This import is above main()'s try, so failing here would exit
+# non-zero without the empty result a hook must always return.
+sys.path.insert(0, str(Path(__file__).resolve().parent))
 from continuity import (  # noqa: E402
     HOSTS,
     MAX_INPUT,

scripts/test_continuity.py

@@ -196,6 +196,26 @@ def test_a_previous_release_binding_still_loads_with_its_digest_intact(self):
         self.assertEqual(runtime.digest(runtime.encoded(loaded)), digest_before)
         self.assertEqual(path.read_bytes(), legacy)
 
+    @unittest.skipIf(sys.version_info < (3, 11), "-P and PYTHONSAFEPATH are 3.11+")
+    def test_every_runtime_script_imports_without_a_path_default(self):
+        """A hook launched under python3 -P must still reach its shared helpers.
+
+        The import sits above main()'s try, so failing there exits non-zero
+        without the empty result a hook is required to return. Older interpreters
+        have no safe-path mode, so the failure cannot arise there."""
+        skill = hook_install.ROOT / "structured-coding/scripts"
+        for name in ("continuity", "checkpoints", "standards"):
+            with self.subTest(script=name):
+                result = subprocess.run(
+                    [sys.executable, "-P", "-c",
+                     "import importlib.util,sys;"
+                     f"spec=importlib.util.spec_from_file_location({name!r},"
+                     f" {str(skill / f'{name}.py')!r});"
+                     "m=importlib.util.module_from_spec(spec);"
+                     "spec.loader.exec_module(m)"],
+                    capture_output=True, text=True)
+                self.assertEqual(result.returncode, 0, result.stderr)
+
     def test_fixture_disables_git_background_maintenance(self):
         """Housekeeping locks otherwise appear mid-test in whole-tree comparisons."""
         for key, expected in (("maintenance.auto", "false"), ("gc.auto", "0")):

structured-coding/scripts/checkpoints.py

@@ -12,6 +12,10 @@
 
 # Installed helpers must not create files in the published skill tree.
 sys.dont_write_bytecode = True
+# Import by location rather than relying on sys.path[0], which is absent under
+# python3 -P. This import is above main()'s try, so failing here would exit
+# non-zero without the empty result a hook must always return.
+sys.path.insert(0, str(Path(__file__).resolve().parent))
 from continuity import (  # noqa: E402
     HOSTS,
     MAX_INPUT,