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/cluster.c

@@ -845,7 +845,7 @@ int cluster_init_phase1(cluster_t* c)
         }
     }
 
-    ha_install_sigusr1(&c->ha);
+    /* ha_install_sigusr1() removed — failover_requested replaced by ha_arm_heartbeat_timeout_vtask */
 
     /* Initialize standby endpoint tracking */
     c->ha.standby_endpoints = (zarray_t *)calloc(1, sizeof(zarray_t));
@@ -1012,7 +1012,7 @@ int cluster_init_phase2(cluster_t* c)
         }
     }
 
-    /* Determine initial role based on am_i_primary() result set by myapp_run */
+    /* Role set by ha_elect_evaluate_and_signal() inside cluster_run() */
     if (ha_is_primary(&c->ha))
         ha_promote_to_primary(c);
     else
@@ -1257,12 +1257,8 @@ int cluster_start(cluster_t* c)
         return rc;
     }
 
-    /* Start HA heartbeat watchdog thread — P1-5 */
-    rc = ha_start_watchdog(&c->ha);
-    if (rc != 0) {
-        ERROR("ha_start_watchdog failed: %d", rc);
-        return rc;
-    }
+    /* ha_start_watchdog() removed — watchdog pthread replaced by
+     * ha_arm_heartbeat_timeout_vtask (delaymgr) */
 
     delay_task(&(c->delaymgr), c->myconf->cluster_config->heartbeat_interval,
                -1, (delay_task_entry_fn_t)check_workers_timeout, (void*)c);