Phase 8D: universal deployment package (XP + Win10/11, two entry points)

One RIOJoy-<ver>.zip now deploys on both OS generations (~75 MB with the
offline XP prerequisites):
- Layout: RIOJoy\app (net48 x64) + RIOJoy\app-xp (net40 x86) +
  RIOJoy\vendor (ViGEmBus; vendor\xp: .NET 4.0 offline installer +
  KB2468871, both signature-verified; RioGamepadXP driver slots in when
  8B lands - build warns/skips until then).
- RIOJoy\install-core.bat: shared OS-detecting install logic (ver ->
  5.1 = XP); pure cmd.exe on the XP path, delegates to install-rio.ps1
  on 10/11. Exports RIOJOY_APPDIR for shortcut creation.
- postinstall.bat (TeslaConsole, unattended): elevates, runs the core,
  then deletes install.bat + README.txt so C:\games stays clean.
- install.bat (standalone computers): same core + Start Menu/desktop
  shortcuts via make-shortcut.vbs (XP-safe); keeps the README.
- README.txt at the zip root explains which entry point to run.
- deploy *.ps1 re-encoded UTF-8-with-BOM: Windows PowerShell read the
  BOM-less files as ANSI, where an em-dash byte parses as a curly quote
  and breaks string parsing (bit install-rio.ps1 in dry-run testing).

Verified: zip layout correct; extracted package dispatch-tested on
Win10 non-elevated (OS detect -> modern route -> admin guard, system
untouched).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

deploy/README.txt

@@ -0,0 +1,59 @@
+RIOJoy - cockpit interface for the VWE pods
+============================================
+
+This package installs RIOJoy, the program that connects the cockpit's RIO
+hardware (joystick, throttle, pedals, 96 lighted buttons, plasma display)
+to games that don't know about the cockpit. It works on two kinds of
+Windows:
+
+  * Windows 10 / 11 (64-bit)  - full app, appears to games as an Xbox 360
+                                controller (ViGEmBus driver, included)
+  * Windows XP SP3 (32-bit)   - full runtime + mapping editor; all
+                                prerequisites are included for offline
+                                install (.NET 4.0 + its async update)
+
+The installer detects which Windows it is running on and installs the
+right pieces automatically. Everything needed is inside this package -
+no internet connection is required.
+
+
+WHICH FILE DO I RUN?
+--------------------
+
+  install.bat      <-- RUN THIS on a normal, standalone computer.
+                       Right-click -> "Run as administrator" (on XP, log
+                       in as an Administrator user first). It installs
+                       the prerequisites and puts RIOJoy shortcuts in the
+                       Start Menu and on the desktop. RIOJoy does NOT
+                       auto-start with Windows - launch it from the
+                       shortcut when you want the cockpit active.
+
+  postinstall.bat  --  Used by the arcade cabinet's launcher software
+                       (TeslaConsole). It runs automatically after the
+                       cabinet extracts this package; you do not need to
+                       run it by hand. (It also deletes install.bat and
+                       this README so the cabinet's games folder stays
+                       clean.)
+
+
+WHAT GETS INSTALLED
+-------------------
+
+  RIOJoy\app\      the program for Windows 10/11
+  RIOJoy\app-xp\   the program for Windows XP
+  RIOJoy\vendor\   third-party prerequisites (ViGEmBus for 10/11;
+                   .NET 4.0 + KB2468871 + the RioGamepadXP joystick
+                   driver for XP)
+
+After installing, start RIOJoy and look for its icon in the system tray
+(near the clock). Right-click the icon to pick a profile, edit button
+mappings, or send commands to the cockpit hardware. Full deployment
+notes for cabinet operators are in RIOJoy\README-DEPLOY.txt.
+
+
+REMOVING RIOJOY
+---------------
+
+Run RIOJoy\pre-uninstall.bat as administrator, then delete the folder
+you extracted. On a standalone computer also delete the RIOJoy shortcuts
+from the Start Menu and desktop.