- loop_builder.rs: Replace LoopSnapshotMergeBox calls with PhiInputCollector for continue-merge PHI generation - json_v0_bridge/lowering/loop_.rs: Replace LoopSnapshotMergeBox calls with PhiInputCollector for continue_merge_bb PHI generation - Unified PHI input handling across all loop builders (loopform_builder, loop_builder, json_v0_bridge) - Tests: mir_loopform_exit_phi all passed (4/4) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>