Docs: local Sacred Gold install required, no hard-coded game path

README explains --game-dir and the stored GameDir; the VS Code launch
uses the stored path and builds through build.ps1.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.vscode/tasks.json

@@ -2,10 +2,13 @@
     "version": "2.0.0",
     "tasks": [
         {
-            "label": "CMake: build",
-            "type": "cmake",
-            "command": "build",
-            "targets": ["all"],
+            // build.ps1 enters the MSVC x86 environment and builds the x86-debug
+            // preset; unlike a CMake Tools task it needs no preset picked in VS Code.
+            "label": "Build x86-debug",
+            "type": "process",
+            "command": "powershell",
+            "args": ["-NoProfile", "-ExecutionPolicy", "Bypass", "-File", "${workspaceFolder}/build.ps1", "x86-debug"],
+            "options": { "cwd": "${workspaceFolder}" },
             "group": { "kind": "build", "isDefault": true },
             "problemMatcher": ["$msCompile"]
         }