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>

capsules/v4/sys/numout.f18

@@ -17,26 +17,8 @@
 macro (-ROT)   SWAP push SWAP pop   endmacro
 
 \ ---- unsigned division (section 4) ----
-\ One step a bit, the divisor in A.  Exact for uhi < ud.
-: UM/MOD ( ulo uhi ud -- urem uquot )
-  a!  N-1 FOR
-    -if L0
-      2* over -if L1  drop 1 + jump L2
-      L1: drop  L2: push 2* pop
-      jump SUB
-    L0:
-      2* over -if L3  drop 1 + jump L4
-      L3: drop  L4: push 2* pop
-      dup a xor -if L5
-        drop -if NOSUB  jump SUB
-      L5: drop dup inv a + inv -if L6
-        drop jump NOSUB
-      L6: push drop pop jump SETBIT
-    SUB:    inv a + inv
-    SETBIT: push 1 + pop
-    NOSUB:
-  NEXT
-  over push push drop pop pop ;
+\ Exact for uhi < ud.  The ROM's entry 1 (MACHINE.md 2.2).
+: UM/MOD  ROM-UM/MOD push ;      \ ( ulo uhi ud -- urem uquot )
 
 \ ---- pictured output ----
 set HDR-NFA here  ", <#  #, 0  #, HDR-NFA  #, HDR-LINK  set HDR-LINK here