chore: checkpoint all prior work for clean state

Captures all uncommitted work from ha-config-bootstrap,
ha-heartbeat-liveness, and associated spec/tooling updates:

- src: ha.c, ha.h, cluster.c, config_repl.c, myapp.c, raft.c —
  heartbeat liveness, RDHUP integration, committing phase fixes
- tests: test_ha_role.c, test_config_repl.c, test_ha_rdhup_integration.c,
  test_p1_integration.c, test_p3_hardening.c, scheduler test
- specs: election-iomgr-refactor, ha-heartbeat-liveness,
  ha-peer-connection-reuse, raft-library (new); ha-config-bootstrap
  and election-iomgr-refactor task/research updates
- tooling: .wolf/ state, ha/data cluster fixtures, raft/raft.tla,
  src/build symlink, xce-build skill update

src/controller/config_repl.c

@@ -1377,6 +1377,7 @@ int handle_ctrlhello(cluster_t *c, endpoint_t *ep, xce_request_t *req)
         c->ha.primary_ctrl_fd == -1) {
         c->ha.primary_ctrl_fd = ep->fd;
         ha_on_heartbeat_received(&c->ha);
+        ha_arm_heartbeat_timeout_vtask(&c->ha, c);
         INFO("HA: primary control channel established (fd=%d)", ep->fd);
     }