feat(v4.0.0): the Q48.16 words and DUMP at the prompt

- capsule/qmath.v4: Q.FROM-INT Q.TO-INT Q.1 Q.0 Q.SCALE Q.+ Q.- Q.* Q./
  Q.ABS Q.NEG Q.= Q.< Q.> Q.0= Q.MAX Q.MIN Q.EXP Q.SQRT Q.LOG Q.SIN Q.COS
  Q.PRINT -- the definitions test_foundation.c executes on the mesh node,
  now in the host node's vocabulary.
- numout.v4: DUMP.
- Q./ by zero, and Q.SQRT and Q.LOG outside their domain, leave the
  result D-11 and D-12 give and then raise an error (D-18): "Division by
  zero", "Argument out of range".  v3 returns 0 silently.
- tests/test_host_quit.c: 122 results printed by Q.PRINT are transcripts
  of the v3 binary, the same at both cell widths; signed values, the
  errors and DUMP's layout besides.

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

v4/capsule/core.v4

@@ -15,6 +15,7 @@
 \    4 Not a character       5 Dictionary full     6 Name missing
 \    7 Control structure mismatch     8 Control structures too deep
 \    9 Shift count out of range      10 Protected word
+\   11 Division by zero (Q./)        12 Argument out of range
 \   -1 the word has printed its own message
 
 macro SWAP   over push push drop pop pop   endmacro