phase29ao(p24): strict/dev adopt pattern7 from facts

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

@@ -379,6 +379,25 @@ pub(crate) fn route_loop_pattern(
             return PlanLowerer::lower(builder, core_plan, ctx);
         }
 
+        if strict_or_dev
+            && matches!(
+                domain_plan,
+                crate::mir::builder::control_flow::plan::DomainPlan::SplitScan(_)
+            )
+        {
+            let facts = outcome
+                .facts
+                .as_ref()
+                .ok_or_else(|| "pattern7 strict/dev adopt failed: facts missing".to_string())?;
+            if facts.facts.split_scan.is_none() {
+                return Err("pattern7 strict/dev adopt failed: facts mismatch".to_string());
+            }
+            let core_plan = PlanNormalizer::normalize_split_scan_from_facts(builder, facts, ctx)?
+                .ok_or_else(|| "pattern7 strict/dev adopt failed: compose rejected".to_string())?;
+            PlanVerifier::verify(&core_plan)?;
+            return PlanLowerer::lower(builder, core_plan, ctx);
+        }
+
         return lower_via_plan(builder, domain_plan, ctx);
     }
 

src/mir/builder/control_flow/plan/normalizer/pattern_split_scan.rs

@@ -4,6 +4,8 @@ use crate::mir::builder::control_flow::edgecfg::api::{
     compose, BlockParams, BranchStub, EdgeStub, ExitKind, Frag,
 };
 use crate::mir::builder::control_flow::joinir::patterns::router::LoopPatternContext;
+use crate::mir::builder::control_flow::plan::facts::loop_facts::SplitScanFacts;
+use crate::mir::builder::control_flow::plan::normalize::CanonicalLoopFacts;
 use crate::mir::builder::MirBuilder;
 use crate::mir::join_ir::lowering::inline_boundary::JumpArgsLayout;
 use crate::mir::{BinaryOp, CompareOp, ConstValue, Effect, EffectMask, MirType};
@@ -11,6 +13,20 @@ use std::collections::BTreeMap;
 use super::common::empty_args;
 
 impl super::PlanNormalizer {
+    pub(in crate::mir::builder) fn normalize_split_scan_from_facts(
+        builder: &mut MirBuilder,
+        facts: &CanonicalLoopFacts,
+        ctx: &LoopPatternContext,
+    ) -> Result<Option<CorePlan>, String> {
+        let Some(split_scan) = facts.facts.split_scan.as_ref() else {
+            return Ok(None);
+        };
+
+        let parts = plan_from_facts(split_scan);
+        let core_plan = Self::normalize_split_scan(builder, parts, ctx)?;
+        Ok(Some(core_plan))
+    }
+
     /// SplitScan → CorePlan 変換
     ///
     /// Expands split-specific semantics into generic CorePlan:
@@ -452,3 +468,13 @@ impl super::PlanNormalizer {
         Ok(CorePlan::Loop(loop_plan))
     }
 }
+
+fn plan_from_facts(facts: &SplitScanFacts) -> SplitScanPlan {
+    SplitScanPlan {
+        s_var: facts.s_var.clone(),
+        sep_var: facts.sep_var.clone(),
+        result_var: facts.result_var.clone(),
+        i_var: facts.i_var.clone(),
+        start_var: facts.start_var.clone(),
+    }
+}