Phase 61: structural if-sum+break lowering (dev-only)

src/mir/join_ir/frontend/ast_lowerer/mod.rs

@@ -189,6 +189,18 @@ impl AstToJoinIrLowerer {
     }
 }
 
+/// Phase 60 dev-only helper: legacy Break(P2) lowering for comparison tests.
+///
+/// `loop_patterns` is private, so this wrapper is exposed at the ast_lowerer boundary.
+#[cfg(feature = "normalized_dev")]
+pub fn lower_break_legacy_for_comparison(
+    lowerer: &mut AstToJoinIrLowerer,
+    program_json: &serde_json::Value,
+) -> JoinModule {
+    loop_patterns::break_pattern::lower_break_legacy_for_comparison(lowerer, program_json)
+        .unwrap_or_else(|e| panic!("legacy break lowering failed: {:?}", e))
+}
+
 impl Default for AstToJoinIrLowerer {
     fn default() -> Self {
         Self::new()