pyproject.toml(chore[test]): register scripts smoke marker

why: ensure pytest discovers the new scripts tests and documents the opt-in marker.
what:
- add scripts directory to pytest testpaths so the new test file is collected.
- declare scripts__runtime_dep_smoketest marker description.

Author: tony

pyproject.toml

@@ -246,6 +246,10 @@ testpaths = [
   "src/vcspull",
   "tests",
   "docs",
+  "scripts",
+]
+markers = [
+  "scripts__runtime_dep_smoketest: run runtime dependency smoke tests",
 ]
 filterwarnings = [
   "ignore:The frontend.Option(Parser)? class.*:DeprecationWarning::",