Normalize passes keep spans and clean warnings

src/mir/join_ir/lowering/min_loop.rs

@@ -54,7 +54,6 @@ pub fn lower_min_loop_to_joinir(module: &crate::mir::MirModule) -> Option<JoinMo
     let mut main_func = JoinFunction::new(main_id, "main".to_string(), vec![]);
 
     let i_init = ValueId(1000); // 固定 ValueId
-    let const_0 = ValueId(1001);
     let const_1 = ValueId(1002);
     let const_2 = ValueId(1003);
 

src/mir/join_ir/lowering/stage1_using_resolver.rs

@@ -49,7 +49,6 @@ use crate::mir::join_ir::lowering::value_id_ranges::stage1_using_resolver as vid
 use crate::mir::join_ir::JoinModule;
 use crate::mir::loop_form::LoopForm;
 use crate::mir::query::{MirQuery, MirQueryBox};
-use crate::mir::ValueId;
 
 /// Phase 27.12: Stage1UsingResolverBox.resolve_for_source の JoinIR lowering（public dispatcher）
 ///

src/mir/join_ir/mod.rs

@@ -22,7 +22,7 @@
 
 use std::collections::BTreeMap;
 
-use crate::mir::{BasicBlockId, ValueId};
+use crate::mir::ValueId;
 
 // Phase 27.9: Lowering submodule
 pub mod lowering;