wwtest: native package-test coordinator

Single-directory package-test planner: discovers *.ww, groups white-box
and external <pkg>_test sources, composes the combined test package,
builds it through the sibling ww driver, and runs it with the runtime's
-package/-list/-timeout-ms contract. test/package holds its E2E corpus
and the manual runtime fixture set.

test/package/runtime/success_test.ww

@@ -0,0 +1,20 @@
+package runtime_success_test;
+
+import test;
+
+@test fn alpha_pass() void = {
+	assert(test.current() != "");
+};
+
+@test fn beta_skip() void = {
+	test.skip("synthetic unavailable feature");
+};
+
+@test fn gamma_expected_abort() void = {
+	test.expectabort();
+	abort();
+};
+
+@test fn delta_pass() void = {
+	assert(6 * 7 == 42);
+};