fix(joinir): Phase 118 Pattern3 exit carrier PHI SSOT

src/mir/builder/control_flow/joinir/merge/mod.rs

@@ -14,7 +14,6 @@
 
 mod block_allocator;
 mod carrier_init_builder;
-#[cfg(debug_assertions)]
 mod contract_checks;
 pub mod exit_line;
 mod exit_phi_builder;
@@ -738,6 +737,48 @@ pub(in crate::mir::builder) fn merge_joinir_mir_blocks(
         debug,
     )?;
 
+    // Phase 118 P2: Contract check (Fail-Fast) - exit_bindings LoopState carriers must have exit PHIs.
+    if let Some(boundary) = boundary {
+        contract_checks::verify_exit_bindings_have_exit_phis(boundary, &exit_carrier_phis)?;
+    }
+
+    // Phase 118 P1: Dev-only carrier-phi SSOT logs (exit_bindings vs carrier_inputs vs exit_carrier_phis)
+    if crate::config::env::joinir_dev_enabled() {
+        if let Some(boundary) = boundary {
+            let exit_binding_names: Vec<&str> = boundary
+                .exit_bindings
+                .iter()
+                .map(|b| b.carrier_name.as_str())
+                .collect();
+            let carrier_input_names: Vec<&str> =
+                merge_result.carrier_inputs.keys().map(|s| s.as_str()).collect();
+            let exit_phi_names: Vec<&str> =
+                exit_carrier_phis.keys().map(|s| s.as_str()).collect();
+
+            trace.stderr_if(
+                &format!(
+                    "[joinir/phase118/dev] exit_bindings carriers={:?}",
+                    exit_binding_names
+                ),
+                true,
+            );
+            trace.stderr_if(
+                &format!(
+                    "[joinir/phase118/dev] carrier_inputs keys={:?}",
+                    carrier_input_names
+                ),
+                true,
+            );
+            trace.stderr_if(
+                &format!(
+                    "[joinir/phase118/dev] exit_carrier_phis keys={:?}",
+                    exit_phi_names
+                ),
+                true,
+            );
+        }
+    }
+
     // Phase 246-EX: CRITICAL FIX - Use exit PHI dsts for variable_map reconnection
     //
     // **Why EXIT PHI, not HEADER PHI?**