feat(raft-library): task 1.1 — build scaffold (raft/ files + meson wiring)

src/lib/testsuite/test_raft.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+
+#include <unity/unity.h>
+
+static void test_raft_placeholder(void)
+{
+    /* placeholder — real tests added in task 2 */
+    TEST_PASS();
+}
+
+void test_raft(void)
+{
+    printf("\n>> raft test\n\n");
+
+    RUN_TEST(test_raft_placeholder);
+}