fix(ext-tester): the standalone tester builds again (beta.2 release stopped on it)

lib/core/extensions/harness/extension_harness.dart

@@ -9,7 +9,6 @@ import 'package:querya_desktop/core/extensions/harness/extension_protocol_profil
 import 'package:querya_desktop/core/extensions/rpc/json_rpc_stdio_client.dart';
 import 'package:querya_desktop/core/extensions/sandbox/sandbox_launch_command.dart';
 import 'package:querya_desktop/core/extensions/sandbox/sandbox_scratch_directory.dart';
-import 'package:querya_desktop/core/util/log_ignored.dart';
 
 /// How to start the plugin process.
 final class HarnessLaunchRequest {
@@ -135,7 +134,7 @@ final class _OsPluginProcess implements HarnessPluginProcess {
     try {
       await _process.exitCode.timeout(const Duration(seconds: 2));
     } catch (e) {
-      logIgnored('extension_harness', e);
+      _ignored('extension_harness', e);
     }
   }
 
@@ -541,7 +540,15 @@ Future<int?> _rssKb(int pid) async {
       return r.exitCode == 0 ? int.tryParse('${r.stdout}'.trim()) : null;
     }
   } catch (e) {
-    logIgnored('extension_harness', e);
+    _ignored('extension_harness', e);
   }
   return null;
 }
+
+/// A failure the harness goes on from (killing a process that already exited,
+/// reading `ps`). This file is compiled into the standalone `querya-ext-tester`
+/// from `lib/core/extensions` alone, so it cannot use `logIgnored` (Flutter and
+/// the app's log): the line goes to stderr.
+void _ignored(String where, Object error) {
+  stderr.writeln('[$where] ignored: $error');
+}

test/core/extensions/harness/ext_tester_pure_dart_test.dart

@@ -0,0 +1,37 @@
+import 'dart:io';
+
+import 'package:flutter_test/flutter_test.dart';
+
+/// `querya-ext-tester` is built by `scripts/ci/build_ext_tester.sh` from
+/// `lib/core/extensions` and `package:path` alone, in a throwaway package. An
+/// import of Flutter or of anything outside that folder breaks the release
+/// build, and no other job builds the tester: beta.2 stopped on `logIgnored`.
+void main() {
+  test('the tester imports only dart:, package:path and core/extensions', () {
+    final importRe = RegExp(r'''^import\s+'([^']+)';''', multiLine: true);
+    final seen = <String>{};
+    final queue = <String>['bin/querya_ext_tester.dart'];
+    final bad = <String>[];
+
+    while (queue.isNotEmpty) {
+      final file = queue.removeLast();
+      if (!seen.add(file)) continue;
+      final text = File(file).readAsStringSync();
+      for (final m in importRe.allMatches(text)) {
+        final uri = m.group(1)!;
+        if (uri.startsWith('dart:') || uri.startsWith('package:path/')) {
+          continue;
+        }
+        const own = 'package:querya_desktop/';
+        if (uri.startsWith('${own}core/extensions/')) {
+          queue.add('lib/${uri.substring(own.length)}');
+        } else {
+          bad.add('$file imports $uri');
+        }
+      }
+    }
+
+    expect(bad, isEmpty, reason: bad.join('\n'));
+    expect(seen.length, greaterThan(3));
+  });
+}