Compiler Parity Breakthrough: Type Resolution Fix Accelerates JIT Test Success

This development log documents a critical advancement in compiler reliability, where fixing a type resolution issue in the lower_binary function increased JIT parity test passes from 8 to 13. The core problem—arithmetic operations defaulting to unresolved SemanticType::Numeric—was causing tests to silently skip rather than validate compilation parity. This progress represents a key milestone in the Phase 12 determinism testing initiative, which ensures all JIT instruction domains have solid test coverage before implementation, establishing a more robust foundation for code generation accuracy and long-term compiler stability.