fix: only skip activation if user explicitly disables extension

Previous logic used config.get() which was affected by defaultValue from
other extensions' package.json. Now we use inspect() to check if the user
has EXPLICITLY set useEnvironmentsExtension to false.

- If user sets to true: activate
- If user sets to false: don't activate
- If user doesn't set anything: activate (default behavior)
- If only defaultValue exists: ignored, activate anyway

This is more robust and matches user intent.

Author: eleanorjboyd

src/extension.ts

@@ -87,25 +87,24 @@ import { registerPoetryFeatures } from './managers/poetry/main';
 import { registerPyenvFeatures } from './managers/pyenv/main';
 
 export async function activate(context: ExtensionContext): Promise<PythonEnvironmentApi | undefined> {
-    // 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.
+    // Use inspect() to check if the user has EXPLICITLY disabled this extension.
+    // Only skip activation if someone explicitly set useEnvironmentsExtension to false.
+    // This ignores defaultValues from other extensions' package.json and defaults to
+    // activating the extension if no explicit setting exists.
     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;
+    // Check for explicit false values (user deliberately disabled the extension)
+    const explicitlyDisabled = inspection?.globalValue === false || 
+                               inspection?.workspaceValue === false ||
+                               inspection?.workspaceFolderValue === false;
+    
+    // DEBUG: Log to stdout which will appear in CI logs
+    console.log('[python-envs] activate() called');
+    console.log('[python-envs] inspection:', JSON.stringify(inspection));
+    console.log('[python-envs] explicitlyDisabled:', explicitlyDisabled);
 
-    const useEnvironmentsExtension = isTestEnvironment || 
-        (hasExplicitValue ? config.get<boolean>('useEnvironmentsExtension', true) : true);
+    const useEnvironmentsExtension = !explicitlyDisabled;
     traceInfo(`Experiment Status: useEnvironmentsExtension setting set to ${useEnvironmentsExtension}`);
     if (!useEnvironmentsExtension) {
         traceWarn(