fix: use inspect() to check for explicit setting values

The previous code used config.get() which may return defaultValue from
other extensions' package.json (like ms-python.python setting
useEnvironmentsExtension to false) even when those extensions aren't
installed.

Now we use inspect() to check if the setting has been explicitly set
by the user (globalValue, workspaceValue, or workspaceFolderValue).
If not explicitly set, we default to true, allowing the extension
to activate properly in test environments and clean VS Code instances.

Author: eleanorjboyd

src/extension.ts

@@ -87,13 +87,25 @@ import { registerPoetryFeatures } from './managers/poetry/main';
 import { registerPyenvFeatures } from './managers/pyenv/main';
 
 export async function activate(context: ExtensionContext): Promise<PythonEnvironmentApi | undefined> {
-    // In smoke/e2e/integration tests, skip the useEnvironmentsExtension check since ms-python.python isn't installed
+    // Check for explicit test environment (set via .vscode-test.mjs env vars)
     const isTestEnvironment = process.env.VSC_PYTHON_SMOKE_TEST === '1' || 
                               process.env.VSC_PYTHON_E2E_TEST === '1' || 
                               process.env.VSC_PYTHON_INTEGRATION_TEST === '1';
 
+    // Use inspect() to check if the setting has been explicitly set by the user.
+    // This is important because config.get() may return a defaultValue from other
+    // extensions' package.json (like ms-python.python setting it to false), even
+    // when those extensions aren't installed.
+    const config = getConfiguration('python');
+    const inspection = config.inspect<boolean>('useEnvironmentsExtension');
+    
+    // If no one has explicitly set this setting, default to true
+    const hasExplicitValue = inspection?.globalValue !== undefined || 
+                             inspection?.workspaceValue !== undefined ||
+                             inspection?.workspaceFolderValue !== undefined;
+    
     const useEnvironmentsExtension = isTestEnvironment || 
-        getConfiguration('python').get<boolean>('useEnvironmentsExtension', true);
+        (hasExplicitValue ? config.get<boolean>('useEnvironmentsExtension', true) : true);
     traceInfo(`Experiment Status: useEnvironmentsExtension setting set to ${useEnvironmentsExtension}`);
     if (!useEnvironmentsExtension) {
         traceWarn(