giles aad178aa0f forth: fix #S / UM/MOD precision bugs — Hayes 628→632/638 (99%) ...

Round 2 conformance fixes:
- forth-pic-step: replace float-imprecise body with same two-step
  16-bit division as # — fixes #S producing '0' instead of full
  binary string (GP6/GN1 pictured-output tests)
- UM/MOD: rewrite with two-phase 16-bit long division using explicit
  t - q*div subtraction, avoiding mod_float vs floor-division
  inconsistency at exact integer boundaries

6 failures remain (SOURCE/>IN tracking and CHAR " with custom delimiter
require deeper interpreter plumbing changes).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-05 21:31:03 +00:00

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