Introduced ConditionPatternBox to detect if condition complexity:
- Simple comparisons (var CmpOp literal): use AST-based if-sum lowerer
- Complex conditions (BinaryOp, etc.): fallback to legacy P3 lowerer
This fixes loop_if_phi.hako which was broken by Phase 219's
is_if_sum_pattern() changes.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
