fix(ci): share compat matrix and restore skill python gating

src/scripts/ci-changed-scope.test.ts

@@ -124,6 +124,16 @@ describe("detectChangedScope", () => {
     });
   });
 
+  it("runs Python skill tests when shared Python config changes", () => {
+    expect(detectChangedScope(["pyproject.toml"])).toEqual({
+      runNode: true,
+      runMacos: false,
+      runAndroid: false,
+      runWindows: false,
+      runSkillsPython: true,
+    });
+  });
+
   it("runs platform lanes when the CI workflow changes", () => {
     expect(detectChangedScope([".github/workflows/ci.yml"])).toEqual({
       runNode: true,