docs: add Phase 130 plan and set Now to Phase 130

docs/development/current/main/01-JoinIR-Selfhost-INDEX.md

@@ -96,17 +96,19 @@ JoinIR の箱構造と責務、ループ/if の lowering パターンを把握
     - `docs/development/current/main/phases/phase-128/README.md`
 31. Phase 129: Materialize join_k continuation + LLVM parity（P1-C done）
     - `docs/development/current/main/phases/phase-129/README.md`
-32. Phase 104: loop(true) break-only digits（VM + LLVM EXE）
+32. Phase 130: if-only Normalized small expr/assign（PLAN）
+    - `docs/development/current/main/phases/phase-130/README.md`
+33. Phase 104: loop(true) break-only digits（VM + LLVM EXE）
     - `docs/development/current/main/phases/phase-104/README.md`
-33. Phase 107: json_cur find_balanced_* depth scan（VM + LLVM EXE）
+34. Phase 107: json_cur find_balanced_* depth scan（VM + LLVM EXE）
     - `docs/development/current/main/phases/phase-107/README.md`
-34. Phase 108: Pattern2 policy router SSOT（入口の薄さを固定）
+35. Phase 108: Pattern2 policy router SSOT（入口の薄さを固定）
     - `docs/development/current/main/phases/phase-108/README.md`
-35. Phase 109: error_tags hints SSOT（Fail-Fast + hint の語彙固定）
+36. Phase 109: error_tags hints SSOT（Fail-Fast + hint の語彙固定）
     - `docs/development/current/main/phases/phase-109/README.md`
-36. MIR Builder（Context 分割の入口）
+37. MIR Builder（Context 分割の入口）
     - `src/mir/builder/README.md`
-37. Scope/BindingId（shadowing・束縛同一性の段階移行）
+38. Scope/BindingId（shadowing・束縛同一性の段階移行）
    - `docs/development/current/main/phase73-scope-manager-design.md`
    - `docs/development/current/main/PHASE_74_SUMMARY.md`
    - `docs/development/current/main/PHASE_75_SUMMARY.md`
@@ -114,9 +116,9 @@ JoinIR の箱構造と責務、ループ/if の lowering パターンを把握
    - `docs/development/current/main/phase78-bindingid-promoted-carriers.md`
    - `docs/development/current/main/phase80-bindingid-p3p4-plan.md`（P3/P4 への配線計画）
    - `docs/development/current/main/phase81-pattern2-exitline-contract.md`（promoted carriers の ExitLine 契約検証）
-31. Boxification feedback（Phase 78–85 の振り返りと Phase 86 推奨）
+39. Boxification feedback（Phase 78–85 の振り返りと Phase 86 推奨）
    - `docs/development/current/main/phase78-85-boxification-feedback.md`
-32. Phase 86: Carrier Init Builder + Error Tags ✅
+40. Phase 86: Carrier Init Builder + Error Tags ✅
    - **Status**: COMPLETE (2025-12-13)
    - **Modules**:
      - `src/mir/builder/control_flow/joinir/merge/carrier_init_builder.rs` (+8 tests)

docs/development/current/main/10-Now.md

@@ -18,13 +18,12 @@
 - Unit tests: 1155/1155 PASS
 - 入口: `docs/development/current/main/phases/phase-129/README.md`
 
-## Next: Phase 130+（Loop patterns / Complex RHS）
+## Next: Phase 130（if-only Normalized small expr/assign）
 
-**Phase 130以降の展開**
-- Loop patterns の Normalized lowering
-- Assign(complex expr) RHS 対応
-- Nested if 対応
-- 詳細は Phase 129 README の "Related Phases" 参照
+**Phase 130: if-only Normalized “Small Expr/Assign” Expansion（dev-only）**
+- 目的: post_k 内の最小 post-if 計算（`x = x + 3; return x`）を Normalized で通す（PHI禁止）
+- 入口: `docs/development/current/main/phases/phase-130/README.md`
+- 受け入れ: Phase 130 VM + LLVM EXE smokes + Phase 129/128 回帰が green
 
 ## 2025-12-18：Phase 127 完了 ✅
 

docs/development/current/main/30-Backlog.md

@@ -8,6 +8,10 @@ Related:
 
 ## 直近（JoinIR/selfhost）
 
+- **Phase 130（if-only Normalized small expr/assign）**
+  - ねらい: loop に行く前に if-only Normalized を “実用” に寄せる（post_k 内の最小計算 `x = x + 3; return x`）
+  - 入口: `docs/development/current/main/phases/phase-130/README.md`
+
 - **real-app loop regression の横展開（VM + LLVM EXE）**
   - ねらい: 実コード由来ループを 1 本ずつ最小抽出して fixture/smoke で固定する（段階投入）。
   - 現状: Phase 107（find_balanced_array/object / json_cur 由来）まで固定済み。

docs/development/current/main/phases/phase-130/README.md

@@ -0,0 +1,87 @@
+# Phase 130: if-only Normalized “Small Expr/Assign” Expansion (dev-only)
+
+Status: PLAN (P0–P3)
+Scope: if-only Normalized（StepTree → Normalized shadow pipeline）
+Related:
+- Entry: `docs/development/current/main/10-Now.md`
+- Phase 129 (join_k/post_k): `docs/development/current/main/phases/phase-129/README.md`
+- ControlTree SSOT: `docs/development/current/main/design/control-tree.md`
+
+## Goal
+
+Increase usefulness of the if-only Normalized path without touching loop lowering yet:
+
+- Enable minimal post-if computation (`x = x + 3`) and returns via env.
+- Keep **PHI禁止**: merge via env + continuations only.
+- Keep **dev-only** and **既定挙動不変**: unmatched shapes fall back (strict can Fail-Fast for fixtures).
+
+## Non-Goals
+
+- No loops (Loop/Break/Continue still rejected by capability guard).
+- No general expression lowering (start with one narrow shape only).
+- No new env vars (use existing `joinir_dev_enabled()` / `joinir_strict_enabled()`).
+
+## Work Items (P0–P3)
+
+### P0: Fixtures + Smokes (VM + LLVM EXE)
+
+Add a “post-if update then return” fixture that forces post_k to execute and tests env updates:
+
+- New fixture: `apps/tests/phase130_if_only_post_if_add_min.hako`
+  - Case A: `flag=1` → expected `5`
+  - Case B: `flag=0` → expected `4`
+  - Output: `5\n4`
+- Smokes (integration):
+  - `tools/smokes/v2/profiles/integration/apps/phase130_if_only_post_if_add_vm.sh`
+  - `tools/smokes/v2/profiles/integration/apps/phase130_if_only_post_if_add_llvm_exe.sh`
+  - Use `output_validator.sh` numeric-line assertion.
+  - LLVM EXE smoke uses `llvm_exe_runner.sh` + plugin gating.
+
+Acceptance:
+- `phase130_*_vm.sh` PASS
+- `phase130_*_llvm_exe.sh` PASS (SKIP allowed only if LLVM prerequisites missing; plugin prerequisites should be satisfied via existing runner)
+
+### P1: Assign(Variable) minimal
+
+Support `x = y` inside post_k (and/or inside branches) for if-only:
+
+- Only local variables (no field/property assign).
+- RHS must resolve from env (`writes` or `inputs`).
+- strict: unsupported shapes → `freeze_with_hint("phase130/assign/var/unsupported", ...)`.
+
+### P2: Assign(Add) minimal for integers
+
+Support `x = x + <int literal>` (exact shape) in post_k:
+
+- Strictly `Var + IntLiteral` with `lhs_var == dst_var` (no commutation, no general binop).
+- Type: integer only (string concat stays out-of-scope; Fail-Fast under strict).
+
+### P3: Verifier tightening (env writes-only discipline)
+
+Add a structural check to ensure env updates only target `writes` fields:
+
+- In Normalized emission, any “env update” must update a field that exists in `EnvLayout.writes`.
+- Writing to an `inputs` field is prohibited (strict Fail-Fast).
+
+## Verification
+
+Commands:
+
+```bash
+cargo test --lib
+
+# New Phase 130 smokes
+bash tools/smokes/v2/profiles/integration/apps/phase130_if_only_post_if_add_vm.sh
+bash tools/smokes/v2/profiles/integration/apps/phase130_if_only_post_if_add_llvm_exe.sh
+
+# Regressions (minimum)
+bash tools/smokes/v2/profiles/integration/apps/phase129_if_only_post_if_return_var_vm.sh
+bash tools/smokes/v2/profiles/integration/apps/phase129_join_k_as_last_vm.sh
+bash tools/smokes/v2/profiles/integration/apps/phase128_if_only_partial_assign_normalized_vm.sh
+```
+
+## Notes
+
+- Phase 130 intentionally stays “if-only” to keep the change-set small and correctness-focused.
+- Loop lowering in Normalized is a separate phase; do not mix scopes.
+