MegaManX6Recomp v1.0.4 borderless diagnostics test 1

v1.0.4-borderless-test.1

This is a Windows diagnostic pre-release for investigating issue #2. It is not
intended to replace v1.0.3 yet.

Tentative fixes:

• Borderless uses a monitor-sized undecorated window without the SDL fullscreen
  flag, preventing drivers from treating Borderless like Exclusive.
• Exclusive requests an explicit desktop-sized display mode.
• The cursor is hidden while a fullscreen game window has focus and restored
  when focus is lost.
• Alt+Enter and Ctrl+F track the applied tri-state mode correctly.

Diagnostics:

• The runtime keeps a bounded history of window, focus, minimize, restore,
  display-change, pixel-size, and fullscreen transition events.
• Reports include SDL/Win32 window flags and styles, logical and pixel sizes,
  monitor bounds, desktop/current modes and refresh rates, DPI, and cursor state.
• Run COLLECT_FULLSCREEN_DIAGNOSTICS.bat while the game is open to create an
  attachable JSON report. The collector excludes disc, BIOS, save, controller,
  and user-directory paths.

This diagnostic package intentionally omits the prebuilt overlay cache. Its
bundled self-contained toolchain fills the cache during play, so first visits
to game areas may load more slowly than in v1.0.3.

Source branches:

• MegaManX6Recomp: prerelease/fullscreen-diagnostics (5a1ff81)
• psxrecomp: fix/sdl3-fullscreen-diagnostics (b138cb7)

Windows ZIP SHA-256: 3DDA0811533349DA3C049C5239AA082531C459501853D91F8AEE92A49E291C1F