feat(ha-commit-durability): cap commit self-contribution at durable_lsn + durable-advance commit wake (task 2.2)

src/controller/testsuite/test_commit_barrier_rollout.c

@@ -496,6 +496,11 @@ static void barrier_setup_vcpus(int n_peers, int n_standbys,
 
     g_bp.current_lsn = current_lsn;
     atomic_store(&g_bp.committed_lsn, 0);
+    /* ha-commit-durability 2.2: self caps at durable_lsn. This stub has no
+     * flusher, so treat the whole appended log (current_lsn - 1) as durable
+     * up front, preserving the pre-durability "self covers every appended
+     * entry" model. (current_lsn == 0 → nothing appended → durable 0.) */
+    atomic_store(&g_bp.durable_lsn, current_lsn > 0 ? current_lsn - 1 : 0);
 
     TEST_ASSERT_EQUAL_INT(0,
                           commit_engine_init(&g_bce, &g_bp, n_peers, n_vcpus));