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>

pubspec.yaml

@@ -1,44 +1,90 @@
-# clide — Dart core package.
+# clide — Flutter desktop IDE for Claude Code.
 #
-# This is the repo-root package: the `clide` CLI (one-shot subcommand
-# mode) and the `clide --daemon` long-running process both compile from
-# `bin/clide.dart` against `lib/`. It has NO Flutter dependency so
-# `dart compile exe` produces a lean static binary.
+# Single package: UI, core subsystems (IPC, PTY, git, pql), and
+# extensions all live here. The Flutter app hosts the IPC server
+# in-process (D-056); tmux owns session persistence (D-041).
 #
-# The Flutter desktop UI lives under `app/` as a separate package that
-# depends on this one via a path: dependency. See D-005 for the
-# layout rationale.
-#
-# Version is mirrored from project.yaml on every bump. project.yaml is
-# the single source of truth — if you change one without the other,
-# `make build`'s ldflag stamping will reveal the drift.
+# Prefer-zero-deps; every third-party entry is exact-pinned and
+# justified. No carets. See D-031.
 
 name: clide
 description: >-
-  Flutter desktop IDE for Claude Code — Dart core (CLI + daemon + shared
-  library). The Flutter UI lives under app/.
-version: 2.0.0-dev
+  Flutter desktop IDE for Claude Code. One Dart package covering the
+  UI, subsystem handlers (pane, files, editor, git, pql), and the
+  extension framework.
 publish_to: none
+version: 2.0.0-dev
 repository: https://git.schweitz.net/jpmschweitzer/clide
 
 environment:
   sdk: ">=3.5.0 <4.0.0"
+  flutter: ">=3.19.0"
 
-# Prefer-zero-deps. Anything added here must be justified against the
-# "write it yourself" default (see memory:
-# feedback_dart_deps_minimal_locked_cve_checked.md). Exact-pin; never
-# carets.
 dependencies:
-  # Dart-team-maintained allocator (`calloc`) + type helpers on top of
-  # dart:ffi. Saves ~50 LOC of malloc/free boilerplate for the PTY
-  # wrapper's libc bindings (socketpair, recvmsg with SCM_RIGHTS,
-  # ioctl). Tiny, zero transitive deps. Listed in
-  # app/assets/licenses.yaml per D-042.
+  flutter:
+    sdk: flutter
+
+  yaml: 3.1.3
+
+  xterm: 4.0.0
+
   ffi: 2.1.3
 
 dev_dependencies:
-  lints: 5.0.0
-  test: 1.25.8
-  # Mocks at IO boundaries (daemon subprocess, socket). Null-safe,
-  # no codegen. Hand-rolled fakes for ChangeNotifier-style services.
+  flutter_test:
+    sdk: flutter
+  flutter_lints: 6.0.0
+
+  integration_test:
+    sdk: flutter
+
+  test: 1.30.0
   mocktail: 1.0.4
+  alchemist: 0.12.1
+
+flutter:
+  uses-material-design: false
+
+  assets:
+    - lib/kernel/src/theme/themes/
+    - lib/kernel/src/i18n/catalog/
+    - assets/licenses.yaml
+    - assets/LICENSE
+    - assets/fonts/jetbrains_mono/OFL.txt
+    - assets/fonts/josefin_sans/OFL.txt
+    - assets/fonts/phosphor/LICENSE
+    - assets/logo/clide-logo.svg
+    - assets/logo/clide-logo-16.png
+    - assets/logo/clide-logo-32.png
+    - assets/logo/clide-logo-48.png
+    - assets/logo/clide-logo-192.png
+    - assets/logo/clide-logo-256.png
+    - assets/logo/clide-logo-512.png
+    - assets/logo/clide-logo-1024.png
+    - assets/grammars/
+    - assets/queries/
+
+  fonts:
+    - family: JosefinSans
+      fonts:
+        - asset: assets/fonts/josefin_sans/JosefinSans-VariableFont.ttf
+        - asset: assets/fonts/josefin_sans/JosefinSans-Italic-VariableFont.ttf
+          style: italic
+
+    - family: Phosphor
+      fonts:
+        - asset: assets/fonts/phosphor/Phosphor.ttf
+        - asset: assets/fonts/phosphor/Phosphor-Bold.ttf
+          weight: 700
+        - asset: assets/fonts/phosphor/Phosphor-Fill.ttf
+
+    - family: JetBrainsMono
+      fonts:
+        - asset: assets/fonts/jetbrains_mono/JetBrainsMono-Regular.ttf
+        - asset: assets/fonts/jetbrains_mono/JetBrainsMono-Italic.ttf
+          style: italic
+        - asset: assets/fonts/jetbrains_mono/JetBrainsMono-Bold.ttf
+          weight: 700
+        - asset: assets/fonts/jetbrains_mono/JetBrainsMono-BoldItalic.ttf
+          weight: 700
+          style: italic