- Move verify_no_phi_dst_overwrite() to debug_assertions.rs - Move verify_phi_inputs_defined() to debug_assertions.rs - Move verify_joinir_contracts() to debug_assertions.rs - Remove duplicate get_instruction_dst() from mod.rs - mod.rs: 1,555 → ~1,380 lines (-176 lines) - Semantic invariance: 154/154 smoke tests PASS, Pattern6 RC:9 Phase 287 P0: Big Files Refactoring (意味論不変) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>