docs(leetcode/20): fix markdownlint MD031 and clarify non-deterministic Character reference comparison

Author: myoshi2891

Algorithm/BinarySearch/leetcode/20. Valid Parentheses/claude sonnet 5/Valid_Parentheses_Java.md

@@ -239,11 +239,12 @@ class Solution {
 > char primitive = boxed; // 自動的にアンボクシングされる
 > ```
 >
-> **応用**：注意が必要なのは、`Character`同士を`==`で比較する場合です。Javaは`\u0000`〜`\u007f`（0〜127、ASCII文字範囲）の値をキャッシュして使い回すため（※`Integer`の`-128`〜`127`とは範囲が異なります）、この範囲内では`==`がたまたま`true`になりますが、範囲外では異なるオブジェクトとして扱われ`false`になることがあります。そのため、オブジェクト比較では`equals()`を使うか、`char`へアンボクシングして値比較を行う必要があります。
+> **応用**：注意が必要なのは、`Character`同士を`==`で比較する場合です。Javaは`\u0000`〜`\u007f`（0〜127、ASCII文字範囲）の値をキャッシュして使い回すため（※`Integer`の`-128`〜`127`とは範囲が異なります）、この範囲内では`==`が常に`true`になりますが、範囲外では参照同一性が保証されず、環境やボクシングのされ方によって`true`または`false`になり得ます。そのため、確実に値を比較するには`equals()`を使うか、`char`へアンボクシングして比較を行う必要があります。
+>
 > ```java
 > Character a = '\u0080';
 > Character b = '\u0080';
-> System.out.println(a == b); // false（キャッシュ範囲外のため別参照）
+> System.out.println(a == b); // true または false（参照同一性が保証されないため依存）
 > System.out.println(a.equals(b)); // true（equals による値比較）
 > System.out.println((char)a == (char)b); // true（アンボクシングによる値比較）
 > ```

public/index.html

@@ -517,8 +517,8 @@ <h1 class="site-title">
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/BinarySearch/leetcode/81.%20Search%20in%20Rotated%20Sorted%20Array%20II/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Search in Rotated Sorted Array II - Technical Analysis</span></span><span class="file-path">Algorithm/BinarySearch/leetcode/81. Search in Rotated Sorted Array II/Claude/README.html</span></a></li>
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-<li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/Other/leetcode/54.%20Spiral%20Matrix/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Spiral Matrix Algorithm Analysis</span></span><span class="file-path">Algorithm/Other/leetcode/54. Spiral Matrix/Claude/README.html</span></a></li>
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/Other/leetcode/59.%20Spiral%20Matrix%20II/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Spiral Matrix Algorithm Analysis</span></span><span class="file-path">Algorithm/Other/leetcode/59. Spiral Matrix II/Claude/README.html</span></a></li>
+<li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/Other/leetcode/54.%20Spiral%20Matrix/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Spiral Matrix Algorithm Analysis</span></span><span class="file-path">Algorithm/Other/leetcode/54. Spiral Matrix/Claude/README.html</span></a></li>
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/Other/leetcode/90.%20Subsets%20II/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Subsets II - 反復的拡張法による重複排除 | アルゴリズム解説</span></span><span class="file-path">Algorithm/Other/leetcode/90. Subsets II/Claude/README.html</span></a></li>
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/TwoPointers/leetcode/80.%20Remove%20Duplicates%20from%20Sorted%20Array%20II/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Two-Pointer Algorithm: Remove Duplicates from Sorted Array II</span></span><span class="file-path">Algorithm/TwoPointers/leetcode/80. Remove Duplicates from Sorted Array II/Claude/README.html</span></a></li>
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/BinarySearch/leetcode/34.%20Find%20First%20and%20Last%20Position%20of%20Element%20in%20Sorted%20Array/READEME-typescript.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">TypeScript Binary Search Performance Analysis</span></span><span class="file-path">Algorithm/BinarySearch/leetcode/34. Find First and Last Position of Element in Sorted Array/READEME-typescript.html</span></a></li>
@@ -709,8 +709,8 @@ <h1 class="site-title">
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/BinarySearch/leetcode/81.%20Search%20in%20Rotated%20Sorted%20Array%20II/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Search in Rotated Sorted Array II - Technical Analysis</span></span><span class="file-path">Algorithm/BinarySearch/leetcode/81. Search in Rotated Sorted Array II/Claude/README.html</span></a></li>
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/Other/leetcode/73.%20Set%20Matrix%20Zeroes/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Set Matrix Zeroes Algorithm - Python Implementation</span></span><span class="file-path">Algorithm/Other/leetcode/73. Set Matrix Zeroes/Claude/README.html</span></a></li>
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/Dutch%20National%20Flag/leetcode/75.%20Sort%20Colors/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Sort Colors Algorithm - Interactive Technical Guide</span></span><span class="file-path">Algorithm/Dutch National Flag/leetcode/75. Sort Colors/Claude/README.html</span></a></li>
-<li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/Other/leetcode/54.%20Spiral%20Matrix/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Spiral Matrix Algorithm Analysis</span></span><span class="file-path">Algorithm/Other/leetcode/54. Spiral Matrix/Claude/README.html</span></a></li>
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/Other/leetcode/59.%20Spiral%20Matrix%20II/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Spiral Matrix Algorithm Analysis</span></span><span class="file-path">Algorithm/Other/leetcode/59. Spiral Matrix II/Claude/README.html</span></a></li>
+<li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/Other/leetcode/54.%20Spiral%20Matrix/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Spiral Matrix Algorithm Analysis</span></span><span class="file-path">Algorithm/Other/leetcode/54. Spiral Matrix/Claude/README.html</span></a></li>
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/Other/leetcode/90.%20Subsets%20II/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Subsets II - 反復的拡張法による重複排除 | アルゴリズム解説</span></span><span class="file-path">Algorithm/Other/leetcode/90. Subsets II/Claude/README.html</span></a></li>
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/TwoPointers/leetcode/80.%20Remove%20Duplicates%20from%20Sorted%20Array%20II/Claude/README.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">Two-Pointer Algorithm: Remove Duplicates from Sorted Array II</span></span><span class="file-path">Algorithm/TwoPointers/leetcode/80. Remove Duplicates from Sorted Array II/Claude/README.html</span></a></li>
 <li class="file-item" data-category="algorithm"><a class="file-link" href="Algorithm/BinarySearch/leetcode/34.%20Find%20First%20and%20Last%20Position%20of%20Element%20in%20Sorted%20Array/READEME-typescript.html"><span class="card-header"><span class="card-icon">🧩</span><span class="card-title">TypeScript Binary Search Performance Analysis</span></span><span class="file-path">Algorithm/BinarySearch/leetcode/34. Find First and Last Position of Element in Sorted Array/READEME-typescript.html</span></a></li>