- Implement Memory-Allocation word set (ALLOCATE/FREE/RESIZE) as
host functions using a top-down arena allocator in WASM linear memory.
Uses wrapping arithmetic for -1 size error cases.
- Fix DU< comparison order (same bug as D<: comparing d2-hi vs d1-hi).
- Register 2VARIABLE/2CONSTANT as callable host functions (pending
codes 9/10) so they work from compiled code like `: CD4 2VARIABLE ;`.
Memory suite: 62→2 errors. Double suite: 27→3 errors.
Total remaining: 56 failures across 9 suites.
ok
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