dissolve app/ into repo root (D-056)

Single Flutter package at the repo root. All code, tests, assets,
and platform directories moved from app/ to root. Package renamed
from clide_app to clide — all imports rewritten. Merged pubspec
combines core (ffi) and app (flutter, yaml, xterm) dependencies.
Makefile simplified: no APP_PRESENT conditionals, no cd, no daemon
lifecycle. 317 tests pass.

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

test/kernel/src/facade_test.dart

@@ -0,0 +1,63 @@
+import 'dart:ui';
+
+import 'package:flutter_test/flutter_test.dart';
+
+import '../../helpers/kernel_fixture.dart';
+
+void main() {
+  group('KernelServices facade', () {
+    test('boot wires every service and they are non-null', () async {
+      final f = await KernelFixture.create();
+      addTearDown(f.dispose);
+      final s = f.services;
+      expect(s.log, isNotNull);
+      expect(s.events, isNotNull);
+      expect(s.settings, isNotNull);
+      expect(s.ipc, isNotNull);
+      expect(s.theme, isNotNull);
+      expect(s.i18n, isNotNull);
+      expect(s.panels, isNotNull);
+      expect(s.arrangement, isNotNull);
+      expect(s.commands, isNotNull);
+      expect(s.palette, isNotNull);
+      expect(s.keybindings, isNotNull);
+      expect(s.clipboard, isNotNull);
+      expect(s.files, isNotNull);
+      expect(s.notify, isNotNull);
+      expect(s.dialog, isNotNull);
+      expect(s.tray, isNotNull);
+      expect(s.secrets, isNotNull);
+      expect(s.os, isNotNull);
+      expect(s.net, isNotNull);
+      expect(s.focus, isNotNull);
+      expect(s.project, isNotNull);
+      expect(s.extensions, isNotNull);
+    });
+
+    test('i18n is preloaded for the namespaces passed to boot', () async {
+      final f = await KernelFixture.create(
+        i18nCatalogs: {
+          'builtin.welcome': {
+            const Locale('en', 'US'): {
+              'title': const {'translation': 'clide'},
+            },
+          },
+        },
+      );
+      addTearDown(f.dispose);
+      expect(
+        f.services.i18n.string(
+          'title',
+          namespace: 'builtin.welcome',
+          placeholder: '-',
+        ),
+        'clide',
+      );
+    });
+
+    test('dispose shuts down IPC + notifiers without throwing', () async {
+      final f = await KernelFixture.create();
+      await f.dispose();
+    });
+  });
+}