出力の空行連続が最長 8 行に収まることを spec に明記

[TwoSquirrels]

「マクロや #ifdef を多用すると出力が空行だらけになりそう」という直感は自然に湧くが、実際にはプリプロセッサの仕様で解決済みだった、という調査結果を spec の出力形式の節に記録します。

• プリプロセッサは 8 行を超える隙間を空行ではなく linemarker で埋め、risundle はそれを #line 1 行に変換する。そのため空行の連続は最長 8 行に収まる (実測ではマクロ 13 個 + #ifdef ブロックのテンプレートで単発 2 つ、Nyaan's Library の NTT 例で最長 2 行連続・全体の 0.3%)。
• 「閾値を決めて #line で畳む」という対策案は、既存動作そのものだった (#pragma once 対応 #11 の #pragma once と同じ、プリプロセス委譲設計が最初から解決していたパターン)。

同じ直感を持ったユーザーやコントリビューターが非問題を直しに来ないよう、仕様として明記しておきます。

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