phase29ac(p1): normalize pattern6 reverse scan and flip smoke to PASS

src/mir/builder/control_flow/joinir/patterns/pattern6_scan_with_init.rs

@@ -65,14 +65,6 @@ pub(crate) fn extract_scan_with_init_plan(
         "phase29ab/pattern6/contract",
     )?;
 
-    // Phase 273 P1: Filter out patterns not supported by Plan-based normalizer
-    if let Some(ref p) = parts {
-        // P1 scope: Only forward scan (step=1) supported
-        if p.step_lit != 1 {
-            return Ok(None);
-        }
-    }
-
     // Wrap in DomainPlan if extracted successfully
     Ok(parts.map(DomainPlan::ScanWithInit))
 }