Replace hardcoded class_idx checks (== 6, == 7) with named macros:
- tiny_class_is_c6(idx) for C6 checks
- tiny_class_is_c7(idx) for C7 checks
- tiny_class_is_ultra(idx) for combined checks
Benefits:
- Self-documenting code (semantic intent is clear)
- Single source of truth for class constants
- Easier to extend to other ULTRA tiers (C5, C8) in future
Changes:
- NEW: core/box/tiny_ultra_classes_box.h (named constants + helpers)
- Modified: core/front/malloc_tiny_fast.h (4 replacements: L181, L193, L326, L337)
No performance impact (zero-cost macros, same compiled code).
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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
