docs(joinir): phase80 plan finalize + fix p3 cond_env mut (dev-only)

Phase 80 後処理:
- phase80-bindingid-p3p4-plan.md: Status を Completed に更新、Task 80-B/C/D チェックマーク追加
- pattern3_with_if_phi.rs: cond_env を mut に修正 + #[allow(unused_mut)] 追加（将来の登録処理に備える）

Phase 80 完全完了（commit 84129a7e）: Pattern2/3/4 全て BindingId 配線完了
Next: Phase 81 - Pattern2 ExitLine contract stabilization

docs/development/current/main/phase80-bindingid-p3p4-plan.md

@@ -1,15 +1,15 @@
 # Phase 80: BindingId P3/P4 Expansion Plan
 
-**Status**: Ready for Task 80-B (Pattern3 Wiring)
+**Status**: Completed (commit `84129a7e`)
 
 **Created**: 2025-12-13
 
 **Progress**:
 - ✅ Task 80-0: Current Status Verification (complete)
 - ✅ Task 80-A: SSOT Design Doc (complete)
-- ⏳ Task 80-B: Pattern3 BindingId Wiring (next)
+- ✅ Task 80-B: Pattern3 BindingId Wiring (dev-only)
-- ⏳ Task 80-C: Pattern4 BindingId Wiring
+- ✅ Task 80-C: Pattern4 BindingId Wiring (dev-only)
-- ⏳ Task 80-D: E2E Tests
+- ✅ Task 80-D: E2E Tests (P3/P4, dev-only)
 
 ---
 
@@ -57,7 +57,7 @@ tools/smokes/v2/run.sh --profile quick --filter "json_pp_vm"
 
 ## Decision: Defer Pattern2 E2E（DigitPos/Trim）until ExitLine contract is stabilized
 
-Phase 80 の主目的は Pattern3/4 の BindingId 配線なので、Pattern2 の E2E は Phase 80-D に回し、
+Phase 80 の主目的は Pattern3/4 の BindingId 配線なので、Pattern2 の E2E は Phase 81+ に回し、
 さらに “promoted carriers（DigitPos/Trim）を含む Pattern2 の ExitLine 接続” が安定してから固定する。
 
 ## Task 80-0: Summary
@@ -74,7 +74,7 @@ Phase 80 の主目的は Pattern3/4 の BindingId 配線なので、Pattern2 の
 **Classification**:
 - **Phase 80 blockers**: NONE
 - **Phase 80 out-of-scope**:
-  - Pattern2（DigitPos/Trim）promoted carriers の ExitLine 契約安定化（Phase 80-D と合わせて着手）
+  - Pattern2（DigitPos/Trim）promoted carriers の ExitLine 契約安定化（Phase 81+）
   - json_lint_vm smoke test failure (pre-existing Pattern2 verifier issue)
 
 **Decision**: ✅ **Proceed to Task 80-A**
@@ -130,11 +130,11 @@ Phase 80 の主目的は Pattern3/4 の BindingId 配線なので、Pattern2 の
 
 **Key function**: `lower_pattern3_if_sum()`
 
-**ConditionEnv creation**: Line ~195 (passed to `lower_if_sum_pattern()`)
+**ConditionEnv creation**: `ConditionEnvBuilder` 生成直後（`lower_if_sum_pattern()` に渡す前）
 
 **BindingId registration points**:
 
-1. **Loop var registration** (lines ~116-128, Pattern2 reference):
+1. **Loop var registration**（dev-only）:
    ```rust
    #[cfg(feature = "normalized_dev")]
    if let Some(loop_var_bid) = builder.binding_map.get(&loop_var_name).copied() {
@@ -144,28 +144,25 @@ Phase 80 の主目的は Pattern3/4 の BindingId 配線なので、Pattern2 の
    }
    ```
 
-2. **Carrier BindingId registration** (via CarrierVar.binding_id):
+2. **Condition bindings registration**（dev-only）:
    ```rust
    #[cfg(feature = "normalized_dev")]
-   for carrier in &carrier_info.carriers {
+   for binding in &inline_boundary.condition_bindings {
-       if let Some(bid) = carrier.binding_id {
+       if let Some(bid) = builder.binding_map.get(&binding.name).copied() {
-           match carrier.role {
+           cond_env.register_condition_binding(bid, binding.join_value);
-               CarrierRole::ConditionOnly => {
+           eprintln!(
-                   cond_env.register_condition_binding(bid, carrier.join_id);
+               "[phase80/p3] Registered condition binding '{}' BindingId({}) -> ValueId({})",
-               }
+               binding.name, bid.0, binding.join_value.0
-               _ => {
+           );
-                   cond_env.register_carrier_binding(bid, carrier.join_id)?;
-               }
-           }
-           eprintln!("[phase80/p3] Registered carrier '{}' BindingId({}) -> ValueId({})",
-                     carrier.name, bid.0, carrier.join_id.0);
        }
    }
    ```
 
-**Timing**: AFTER ValueId allocation, BEFORE condition lowering
+**Timing**: BEFORE condition lowering
 
-**Data source**: `CarrierVar.binding_id` (populated by CarrierBindingAssigner in Phase 78)
+**Note (重要)**:
+- Pattern3/4 は lowering の後段（ExitMeta / merge 側）で carrier join_id が確定するため、Phase 80 では **carriers の BindingId 登録はしない**。
+- ここでの目的は「条件 lowering（lookup_with_binding）」の経路を先に BindingId 化して、shadowing の破綻を防ぐこと。
 
 ---
 
@@ -175,35 +172,19 @@ Phase 80 の主目的は Pattern3/4 の BindingId 配線なので、Pattern2 の
 
 **Key function**: `cf_loop_pattern4_with_continue()`
 
-**ConditionEnv creation**: Within `lower_loop_with_continue_minimal()` (lines ~341-350)
+**ConditionEnv creation**: `lower_loop_with_continue_minimal()` 内
 
 **BindingId registration points**:
 
-1. **Loop var registration** (same pattern as P3):
+1. **Caller side**（dev-only）: `binding_map` を lowerer に渡す
-   ```rust
-   #[cfg(feature = "normalized_dev")]
-   if let Some(loop_var_bid) = builder.binding_map.get(&loop_var_name).copied() {
-       cond_env.register_loop_var_binding(loop_var_bid, loop_var_join_id);
-       eprintln!("[phase80/p4] Registered loop var '{}' BindingId({}) -> ValueId({})",
-                 loop_var_name, loop_var_bid.0, loop_var_join_id.0);
-   }
-   ```
 
-2. **Carrier BindingId registration** (via CarrierVar.binding_id from Pattern4CarrierAnalyzer):
+2. **Lowerer side**（dev-only）: join_id が確定したタイミングで
-   ```rust
+   - loop var / condition bindings / carriers を BindingId 登録する
-   #[cfg(feature = "normalized_dev")]
+   - ログは `[phase80/p4]` タグで可視化する
-   for carrier in &carrier_info.carriers {
-       if let Some(bid) = carrier.binding_id {
-           cond_env.register_carrier_binding(bid, carrier.join_id)?;
-           eprintln!("[phase80/p4] Registered carrier '{}' BindingId({}) -> ValueId({})",
-                     carrier.name, bid.0, carrier.join_id.0);
-       }
-   }
-   ```
 
 **Special note**: Trim patterns (skip_whitespace) use promoted carriers, BindingId comes from `promoted_bindings` map via CarrierBindingAssigner
 
-**Timing**: AFTER ValueId allocation, BEFORE continue condition lowering
+**Timing**: ValueId allocation の直後（condition lowering の前）
 
 ---
 
@@ -228,29 +209,19 @@ Phase 80 の主目的は Pattern3/4 の BindingId 配線なので、Pattern2 の
 ### Implementation Order
 
 1. ✅ Task 80-A: Design doc (this section)
-2. ⏳ Task 80-B: Pattern3 wiring
+2. ✅ Task 80-B: Pattern3 wiring（loop var + condition bindings）
-   - Modify `pattern3_with_if_phi.rs`
+3. ✅ Task 80-C: Pattern4 wiring（lowerer 側で登録）
-   - Add BindingId registration for loop var + carriers
+4. ✅ Task 80-D: E2E tests（P3 1本 / P4 1本, `tests/normalized_joinir_min.rs`）
-   - Add `[phase80/p3]` debug logs
-3. ⏳ Task 80-C: Pattern4 wiring
-   - Modify `pattern4_with_continue.rs`
-   - Add BindingId registration for loop var + carriers
-   - Add `[phase80/p4]` debug logs
-4. ⏳ Task 80-D: E2E tests
-   - Add 2 tests to `tests/normalized_joinir_min.rs`
-   - Verify BindingId hit, NO fallback
-   - 972/972 lib tests PASS (970 + 2 new)
 
 ---
 
 ### Success Metrics
 
-- [ ] P3 BindingId registration operational (debug logs show hits)
+- [x] P3: 条件 lowering が BindingId 経路で解決できる（E2Eテストで固定）
-- [ ] P4 BindingId registration operational (debug logs show hits)
+- [x] P4: 条件 lowering が BindingId 経路で解決できる（E2Eテストで固定）
-- [ ] Fallback detection working (tests can detect fallback)
+- [x] Fallback 検知（`[binding_pilot/fallback]` をテストで検知できる）
-- [ ] 972/972 lib tests PASS (970 existing + 2 new E2E)
+- [x] `cargo test --release --lib` が PASS（production 影響なし）
-- [ ] Smoke tests stable (no new failures)
+- [x] 追加コードは dev-only（`normalized_dev`）に閉じている
-- [ ] All code dev-only (`#[cfg(feature = "normalized_dev")]`)
 
 ---
 
@@ -273,12 +244,12 @@ Phase 80 の主目的は Pattern3/4 の BindingId 配線なので、Pattern2 の
 
 ## Implementation Tasks (pending Task 80-0 completion)
 
-1. Pattern3 (if-sum) BindingId 登録配線
+1. Pattern3 (if-sum) BindingId 登録配線 ✅
-2. Pattern4 (continue) BindingId 登録配線
+2. Pattern4 (continue) BindingId 登録配線 ✅
-3. E2E tests (P3 1本 / P4 1本)
+3. E2E tests (P3 1本 / P4 1本) ✅
 
 ## Success Metrics
 
 - P3/P4 代表ケースで lookup_with_binding() 経路がヒット（ログ or テスト）
 - Fallback 検知可能（既存 `[binding_pilot/fallback]` タグ活用）
-- 970/970 lib tests PASS (+ new tests)
+- `cargo test --release --lib` PASS（退行なし）

src/mir/builder/control_flow/joinir/patterns/pattern3_with_if_phi.rs

@@ -119,7 +119,8 @@ impl MirBuilder {
         let loop_var_name = ctx.loop_var_name.clone();
         let loop_var_id = ctx.loop_var_id;
 
-        let (cond_env, condition_bindings, _loop_var_join_id) =
+        #[allow(unused_mut)]
+        let (mut cond_env, condition_bindings, _loop_var_join_id) =
             ConditionEnvBuilder::build_for_break_condition_v2(
                 condition,
                 &loop_var_name,