feat(phase12.7): 糖衣構文Phase 12.7-B完了 + 自律型AI開発システム制御機能

🚀 Phase 12.7-B: ChatGPT5糖衣構文（基本実装完了）
- パイプライン演算子（|>）実装
- セーフアクセス（?.）とデフォルト値（??）実装
- sugar gateによる段階的有効化機能
- 糖衣構文テストスイート追加

🤖 自律型AI開発システム改善
- codex-async-notify.sh: タスク制御指示追加
  - "下の箱を積み過ぎないように先に進んでください"
  - "フェーズが終わったと判断したら止まってください"
- プロセス数表示機能の改善（count_running_codex_display）
- 自動停止機能が正常動作（Phase 12.7-C前で停止確認）

📚 ドキュメント更新
- Paper 13: 自律型AI協調開発システムの革新性を文書化
- ANCP可逆マッピング仕様追加
- nyfmt PoC（フォーマッター）計画追加

🧱 箱理論の体現
- 74k行のコードベース（Phase 15で20k行を目指す）
- ANCP適用で最終的に6k行相当を狙う
- 世界最小の実用コンパイラへの道

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/tools/nyfmt/CI_SNIPPET.md

@@ -0,0 +1,25 @@
+# Optional CI Snippet (nyfmt PoC)
+
+This is a documentation‑only snippet showing how to wire a non‑blocking nyfmt PoC check in CI. Do not enable until the PoC exists.
+
+```yaml
+# .github/workflows/nyfmt-poc.yml (example; disabled by default)
+name: nyfmt-poc
+on:
+  workflow_dispatch: {}
+  # push: { branches: [ never-enable-by-default ] }
+
+jobs:
+  nyfmt:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Print nyfmt PoC smoke
+        run: |
+          chmod +x tools/nyfmt_smoke.sh
+          NYFMT_POC=1 ./tools/nyfmt_smoke.sh
+```
+
+Notes
+- Keep this job opt‑in (workflow_dispatch) until the formatter PoC exists.
+- The smoke script only echoes guidance; it does not fail the build.

docs/tools/nyfmt/NYFMT_POC_ROADMAP.md

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+# nyfmt Reversible Formatter – PoC Roadmap
+
+Status: Proposal (docs only)
+
+Goal: A reversible code formatter for Nyash that enables round‑trip transforms (format → parse → print → original) for ANCP/Phase 12.7 sugar while preserving developer intent.
+
+## PoC Scope (Phase 1)
+- Define reversible AST surface subset (no semantics changes).
+- Implement pretty‑printer prototype in Rust or script (out of tree), constrained to subset.
+- Add examples demonstrating round‑trip invariants and failure modes.
+
+Round‑trip invariants (subset)
+- Pipeline: `lhs |> f(a)` ⇄ `f(lhs,a)`
+- Safe Access: `a?.b` ⇄ `peek a { null => null, else => a.b }`
+- Default: `x ?? y` ⇄ `peek x { null => y, else => x }`
+- Range: `a .. b` ⇄ `Range(a,b)`
+- Compound Assign: `x += y` ⇄ `x = x + y` (var/field target)
+
+## VSCode Extension Idea
+- Commands:
+  - "Nyfmt: Format (reversible subset)"
+  - "Nyfmt: Verify Round‑Trip"
+- On‑save optional gate with env flag `NYFMT_POC=1`.
+- Diagnostics panel lists non‑reversible constructs.
+
+## Examples and Smokes
+- Place minimal examples under `apps/nyfmt-poc/`.
+- Add a smoke script `tools/nyfmt_smoke.sh` that:
+  - echoes `NYFMT_POC` and current subset level
+  - prints instructions and links to `ANCP-Reversible-Mapping-v1.md`
+  - shows Before/Canonical/Round‑Trip triads from examples
+
+## Non‑Goals
+- Changing Nyash runtime/semantics.
+- Enforcing formatting in CI (PoC is opt‑in).