Function tf_setup_cache_sentinel

tests/test_main.c:200–216

};

static bool tf_setup_cache_sentinel(void) {
    snprintf(tf_home_sentinel, sizeof(tf_home_sentinel), "/tmp/cbm-test-home-XXXXXX");
    if (!cbm_mkdtemp(tf_home_sentinel)) {
        return false;
    }
    /* Legacy integration fixtures derive DB paths from HOME, while production
     * cache_dir() prefers CBM_CACHE_DIR. A private HOME plus no inherited cache
     * override keeps both conventions pointed at the same isolated tree. */
    cbm_setenv("HOME", tf_home_sentinel, 1);
    cbm_unsetenv("CBM_CACHE_DIR");
    for (size_t i = 0U; i < sizeof(tf_client_home_overrides) / sizeof(tf_client_home_overrides[0]);
         i++) {
        cbm_unsetenv(tf_client_home_overrides[i]);
    }
    atexit(tf_cleanup_cache_sentinel);
    return true;
}

/* Fast real-process probes for the async index-supervisor contract. They run
 * only in a child admitted by the exact build-bound worker grammar. */