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>

lib/main.dart

@@ -0,0 +1,140 @@
+import 'package:clide/app.dart';
+import 'package:clide/builtin/canvas/canvas.dart';
+import 'package:clide/builtin/claude/claude.dart';
+import 'package:clide/builtin/claude_control/claude_control.dart';
+import 'package:clide/builtin/decisions/decisions.dart';
+import 'package:clide/builtin/default_layout/default_layout.dart';
+import 'package:clide/builtin/diff/diff.dart';
+import 'package:clide/builtin/editor/editor.dart';
+import 'package:clide/builtin/extensions_ui/extensions_ui.dart';
+import 'package:clide/builtin/files/files.dart';
+import 'package:clide/builtin/git/git.dart';
+import 'package:clide/builtin/grammars_core/grammars_core.dart';
+import 'package:clide/builtin/graph/graph.dart';
+import 'package:clide/builtin/ipc_status/ipc_status.dart';
+import 'package:clide/builtin/keybindings_ui/keybindings_ui.dart';
+import 'package:clide/builtin/markdown/markdown.dart';
+import 'package:clide/builtin/pql/pql.dart';
+import 'package:clide/builtin/problems/problems.dart';
+import 'package:clide/builtin/settings_ui/settings_ui.dart';
+import 'package:clide/builtin/terminal/terminal.dart';
+import 'package:clide/builtin/theme_picker/theme_picker.dart';
+import 'package:clide/builtin/tickets/tickets.dart';
+import 'package:clide/builtin/todos/todos.dart';
+import 'package:clide/builtin/welcome/welcome.dart';
+import 'dart:io' show Directory, Platform;
+
+import 'package:clide/kernel/kernel.dart';
+import 'package:clide/kernel/src/syntax/tree_sitter_ffi.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart' show rootBundle;
+import 'package:flutter/widgets.dart';
+
+Future<void> main() async {
+  final binding = WidgetsFlutterBinding.ensureInitialized();
+
+  binding.ensureSemantics();
+
+  TreeSitterLib.init();
+
+  final appDir = await _resolveAppDir();
+  final themes = await _loadBundledThemes();
+
+  final services = await KernelServices.boot(
+    appDir: appDir,
+    bundledThemes: themes,
+    i18nLoader: AssetCatalogLoader(bundle: rootBundle),
+    preloadNamespaces: _tier0Namespaces,
+    // The local unix-socket daemon is desktop-only. On web the
+    // connection indicator stays `disconnected` — that's the honest
+    // state: the Flutter-web build can't reach a local socket.
+    autoStartDaemonClient: !kIsWeb,
+    socketPath: kIsWeb ? '/clide-web-no-socket' : null,
+  );
+
+  // Register every built-in. Tier 0 activates only the four that do
+  // real work; the rest compile in as stubs so the extensions-ui can
+  // list them when Tier 6 lands.
+  services.extensions
+    ..register(DefaultLayoutExtension())
+    ..register(WelcomeExtension())
+    ..register(IpcStatusExtension())
+    ..register(ThemePickerExtension())
+    ..register(ClaudeExtension())
+    ..register(TerminalExtension())
+    ..register(FilesExtension())
+    ..register(EditorExtension())
+    ..register(GrammarsCoreExtension())
+    ..register(MarkdownExtension())
+    ..register(DiffExtension())
+    ..register(GitExtension())
+    ..register(PqlExtension())
+    ..register(TodosExtension())
+    ..register(ProblemsExtension())
+    ..register(CanvasExtension())
+    ..register(GraphExtension())
+    ..register(SettingsUiExtension())
+    ..register(ExtensionsUiExtension())
+    ..register(KeybindingsUiExtension())
+    ..register(DecisionsExtension())
+    ..register(TicketsExtension())
+    ..register(ClaudeControlExtension());
+
+  await services.extensions.activateAll();
+
+  if (!kIsWeb) {
+    await services.project.loadRecents();
+    var opened = await services.project.openLast();
+    if (!opened) {
+      opened = await services.project.open(Directory.current.path);
+    }
+    if (opened) {
+      services.panels.activateTab(Slots.workspace, 'claude.primary');
+    }
+  }
+
+  runApp(ClideApp(services: services));
+}
+
+/// Resolve the app-settings directory.
+///
+/// On web we don't touch the filesystem — hand back a sentinel dir so
+/// `SettingsStore.load()` silently no-ops (its read-file helper returns
+/// `{}` when the file doesn't exist).
+Future<Directory> _resolveAppDir() async {
+  if (kIsWeb) return Directory('/clide-web-no-disk');
+  final home = Platform.environment['HOME'] ?? '/tmp';
+  final xdg = Platform.environment['XDG_CONFIG_HOME'] ?? '$home/.config';
+  final dir = Directory('$xdg/clide');
+  await dir.create(recursive: true);
+  return dir;
+}
+
+Future<List<ThemeDefinition>> _loadBundledThemes() async {
+  const loader = ThemeLoader();
+  const paths = [
+    'lib/kernel/src/theme/themes/clide.yaml',
+    'lib/kernel/src/theme/themes/midnight.yaml',
+    'lib/kernel/src/theme/themes/paper.yaml',
+    'lib/kernel/src/theme/themes/terminal.yaml',
+  ];
+  final out = <ThemeDefinition>[];
+  for (final p in paths) {
+    out.add(await loader.fromAsset(rootBundle, p));
+  }
+  return out;
+}
+
+/// Every Tier-0 extension that ships an i18n catalog. Extensions
+/// registered but not active (the 17 stubs) don't preload — their
+/// catalogs load lazily on activate in later tiers.
+const List<String> _tier0Namespaces = [
+  'builtin.default-layout',
+  'builtin.welcome',
+  'builtin.ipc-status',
+  'builtin.theme-picker',
+  'builtin.terminal',
+  'builtin.files',
+  'builtin.claude',
+  'builtin.editor',
+];