Minor cleanups June 2026

In the spirit of previous such PRs, this PR proposes a collection of nonfunctional changes.

I am happy to incorporate changes from other devs, and revert some of the proposed changes if the maintainers ask me to.

Apart from trivial changes, the proposed changes so far include:

* A requested edit to `AUTHORS` and a resorting of all entries, following DIN 5007 for the treatment of any special characters.
* Exclude the two recent integer type renaming commits from git blame.
* Tightening of some static asserts in `history.h` to avoid overflows. (Note that rounding errors for floating point types could lead to the assert in `operator<<` triggering at run-time.)
* Re-instate the 0.5s maximal thinking time in case of a single legal move and reword the comment to make it clear that it should not be tuned.
* ~~A small refactoring of the network loading code thanks to @dubslow.~~
* A refactoring of the "dtz is dtm" code, also thanks to @dubslow.

closes https://github.com/official-stockfish/Stockfish/pull/6928

No functional change

src/attacks.cpp

@@ -70,7 +70,7 @@ static void init_magics(Magic magics[][2]) {
 
 // Sliding attacks within a rank, indexed by the slider's file and the
 // 8-bit rank occupancy, yielding the 8-bit attack set on that rank
-[[maybe_unused]] constexpr auto RankAttacks = []() {
+constexpr auto RankAttacks = []() {
     std::array<std::array<u8, 256>, FILE_NB> table{};
     for (int file = 0; file < 8; ++file)
         for (int occ = 0; occ < 256; ++occ)
@@ -117,8 +117,7 @@ void init_magics(PieceType pt, Bitboard table[], Magic magics[][2]) {
         m.attacks        = s == SQ_A1 ? table : magics[s - 1][pt - BISHOP].attacks + size;
         size             = 0;
 
-        Bitboard                  b           = 0;
-        [[maybe_unused]] Bitboard prevSliding = -1;
+        Bitboard b = 0;
         do
         {
             occupancy[size] = b;