INI import: strip greeting quotes; add gsheet reference

Strip a surrounding pair of double quotes from the [Plasma] Greeting on
import (the gsheet "INI_V2" output writes Greeting="..."), and add the
master button-layout spreadsheet that documents the RIO.ini format and the
16-bit map-word encoding. Test covers the real sheet output (modifier-stacked
words, keypad VK words, RIO command words) round-tripping verbatim.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/RioJoy.Core.Tests/Profiles/RioIniImporterTests.cs

@@ -55,4 +55,37 @@ public class RioIniImporterTests
         RioProfile p = RioIniImporter.Import("[JoyStick]\ninvertX = true");
         Assert.True(p.Calibration.EnableZR);
     }
+
+    // The real gsheet "INI_V2" output: modifier-stacked words (0x8F26 =
+    // lit+shift+ctrl+alt+ext + VK 0x26), keypad VK words (0x30), and RIO
+    // command words (0x7000) must all survive import verbatim.
+    private const string SheetSample = """
+        ;RIO INI V2 built useing gsheet configurator's final value
+        [Desktop]
+        File=C:\games\RIO\defalt.bmp
+        [Plasma]
+        Greeting="Hello,"
+        [JoyStick]
+        invertX=0
+        enableZR=1
+
+        [Buttons]
+        RIO04=0x8F26
+        RIO50=0x30
+        RIO60=0x7000
+        RIO6F=0x700F
+        """;
+
+    [Fact]
+    public void Imports_RealSheetOutput_PreservesRawWords()
+    {
+        RioProfile p = RioIniImporter.Import(SheetSample, "Sheet");
+
+        Assert.Equal(0x8F26, p.Buttons[0x04]); // lit + all modifiers + extended
+        Assert.Equal(0x30, p.Buttons[0x50]);   // keypad '0'
+        Assert.Equal(0x7000, p.Buttons[0x60]); // RIO command word
+        Assert.Equal(0x700F, p.Buttons[0x6F]); // last address in the table
+        Assert.Equal(@"C:\games\RIO\defalt.bmp", p.WallpaperPath);
+        Assert.Equal("Hello,", p.PlasmaGreeting); // surrounding quotes stripped
+    }
 }