v0.5.0 final pass: AI and Deck fixes (D565-D567), docs and site refresh

Fixes:
- D565: AI awareness no longer follows two player render settings. Fog
  distance is floored at 100 (below it the shortened clip hid guards from
  AI on-screen checks); the D466 gameplay fog cull is rescaled to the game's
  own FOV (identity at defaults).
- D566: Steam Deck Game Mode no longer shows the on-screen keyboard at
  launch (SDL text input stopped; screen-keyboard hint off).
- D567: opening PC Options from the front end with a pad no longer drags
  the game's crosshair to the top-left corner.

Docs and site:
- README News/Status/Features/controls brought up to date; the unpublished
  v0.4.1 work is folded into v0.5.0 everywhere; stats to v0.5.0.
- Release notes reordered: player-facing highlights first, finding labels
  and verification at the bottom.
- Site status rewritten; favicon is now the exe icon (make_icon.py writes
  docs/favicon.ico).
- ROADMAP: AI review results, update-check follow-up, stale rows closed.

Verified: Windows + Linux builds; Windows pixel gate Surface 1 PASS;
Deck build deployed for the maintainer's Game Mode checks.

docs/saves.md

@@ -17,8 +17,9 @@ A few details:
 - The **PFS / Memory-Pak and motor (Rumble Pak) code** is only for accessory
   detection and is stubbed to report "no accessory," so the game proceeds
   without a Memory Pak.
-- **Emulator saves can be imported** — copy a `GOLDENEYE-usa.eep` in as
-  `data/ge007.eep` (see the README's *Using an emulator save*).
+- **Emulator saves load directly** — an emulator-format `ge007.eep` placed
+  in `data/` is converted on first launch, so a Project64, mupen or 1964
+  save continues in the port (see the README's *Using an emulator save*).
 - The save's **checksum is part of the file format**. The PRNG/CRC the save
   depends on is kept byte-stable, because changing it would silently
   invalidate existing saves — a porting-notes finding (D9).