feat(v4): the kernel keeps a registry of nodes and checks who may ask (MESH.md 9a.4)

Any node may birth and wire its own; only Hera sleeps, wakes and kills, by
number.  Requests have fixed numbers, -6 to -18.  NODE-BORN takes the
number; NODE-KILL a number.  test_manage.c: 41 checks at both widths.

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

capsules/v4/hera.4th

@@ -57,7 +57,7 @@ Block 8003
 ( this one: empty, then the nucleus, then FORTH-79.          )
 : BIRTH ( number port -- place )
   (KIDP) !  (KID#) !
-  NODE-BORN DUP 0< IF (FAIL) THEN (KID) !
+  (KID#) @ NODE-BORN DUP 0< IF (FAIL) THEN (KID) !
   NODE-ME (KIDP) @ (KID) @ 2 NODE-WIRE 0= IF (FAIL) THEN
   (NUCLEUS)
   (KID#) @ (KIDP) @ ROUTE  (KID#) @ (KIDP) @ NEIGHBOUR  (WHO)
@@ -105,7 +105,7 @@ Block 8006
 : KILL ( n -- )
   DUP (WHICH) DUP 0< IF
     DROP DROP ." KILL: no such node" CR  -1 NODE-ERROR ! THEN
-  DUP (KID@) 1+ @ NODE-KILL  (UNLIST)
+  OVER NODE-KILL  (UNLIST)
   DUP NO-ROUTE
   (KIDS#) @ DUP IF 0 DO DUP I (KID@) @ GONE LOOP ELSE DROP THEN
   DROP ;