feat(v4): the system's UM*, UM/MOD, D+, DNEGATE, Q.* and Q./ call the ROM

MACHINE.md 2.2.  Each is its entry's address, push and ;.  Every node the
tests make carries the host ROM (host_load, Hera's births, the depth and
mesh tests' own nodes), and a division by zero inside the ROM returns to
the prompt (hosted-check).  test_host_quit's fetch outside memory moves
past the ROM's range: 16384 is the ROM's first word now the tests' system
has its ROM, as the product's always had.  dict_hash 0xfec8c47cfc6f437f.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

v4/tests/test_host_unit.c

@@ -143,6 +143,7 @@ static int host_born(void *self)
     v4_node_stack_regs_attach(&pool[k].n, DSTACK_REG, RSTACK_REG);
     v4_node_error_attach(&pool[k].n, NODE_ERROR);
     v4_node_fault_attach(&pool[k].n, w_fault);
+    v4_node_rom_attach(&pool[k].n, ROM_IMAGE, ROM_IMAGE_WORDS);   /* the nucleus calls its math in the ROM (MACHINE.md 2.2) */
     v4_blocks_init(&node_blocks[k], BUF0_W);
     if (k != 0) {                                    /* Hera's kernel is wired where she is made */
         node_kernel[k].take = node_kernel_take; node_kernel[k].give = 0; node_kernel[k].self = &pool[k];