rename CLIDE_WORKSPACE to CLIDE_PROJECT

Missed in the workspace → project rename. Consistent with the
project.open / project.validate / ProjectOpened naming.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/kernel/src/backend_entry.dart

@@ -30,7 +30,7 @@ import 'package:clide/src/pql/client.dart';
 class BackendBootMessage {
   const BackendBootMessage({required this.frontendPort, this.hintRoot});
   final SendPort frontendPort;
-  /// Optional path hint for initial toolchain resolution (e.g. CLIDE_WORKSPACE).
+  /// Optional path hint for initial toolchain resolution (e.g. CLIDE_PROJECT).
   /// Used to find project-local binaries like dugite before a project opens.
   final String? hintRoot;
 }

lib/main.dart

@@ -66,7 +66,7 @@ Future<void> main() async {
   // With proper signing (Developer ID), no sandbox or isolate needed.
   final toolchain = Toolchain();
   if (!kIsWeb) {
-    const workspace = String.fromEnvironment('CLIDE_WORKSPACE');
+    const workspace = String.fromEnvironment('CLIDE_PROJECT');
     final root = workspace.isNotEmpty ? workspace : Directory.current.path;
     toolchain.applyResolved(resolveToolchainPaths(root));
   }

lib/test_app.dart

@@ -67,7 +67,7 @@ class _ClideTestAppState extends State<ClideTestApp> {
   }
 
   Future<void> _runTests() async {
-    const workspace = String.fromEnvironment('CLIDE_WORKSPACE');
+    const workspace = String.fromEnvironment('CLIDE_PROJECT');
     const category = String.fromEnvironment('CLIDE_TESTMODE');
     final workDir = workspace.isNotEmpty ? workspace : Directory.current.path;