chore: simplify gitignore rules for releases binaries

- Ignore all files in releases/ directory (binaries, archives, checksums)
- Preserve releases/memory/ for changelog tracking
- Changed from 'releases/' to 'releases/*' for clearer intent

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.gitignore

@@ -74,8 +74,7 @@ Network Trash Folder
 Temporary Items
 .apdisk
 
-# Release artifacts, but DO track releases/memory/ for changelog
-releases/
-!releases/
+# Release artifacts (binaries, archives, checksums), but DO track releases/memory/ for changelog
+releases/*
 !releases/memory/
 !releases/memory/**