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/testsuite/test_config_repl.c

@@ -886,13 +886,14 @@ static void test_upgrade_config_req_extract_raw(void)
     free(out_sha256);
     free(buf);
 
-    /* The decoded-form variant must always return -ENOTSUP */
+    /* xce_upgrade_config_req_extract: returns -EINVAL on a zeroed request
+     * (body_which is 0, not Request_body_upgradeconfigrequestmsg). */
     {
         xce_request_t dummy_req;
         memset(&dummy_req, 0, sizeof(dummy_req));
         uint8_t *b = NULL, *s = NULL;
         size_t   l = 0;
-        TEST_ASSERT_EQUAL_INT(-ENOTSUP,
+        TEST_ASSERT_EQUAL_INT(-EINVAL,
             xce_upgrade_config_req_extract(&dummy_req, &b, &l, &s));
     }