Initial commit: Grounded Flutter frontend

A to-do app that doesn't believe you — an enforcement layer rather than a
neutral ledger.

Architecture ported from Autoreceptives/Frontend/Receptive: stacked MVVM with
the mandatory 4-file screen pattern, one ParentViewModel owning the loading /
network / error overlays and the handleError decision tree, one AppDataManager
gateway, dio comms carrying the three identity headers, secure storage with
random-suffixed keys, and a single-chokepoint Navigator. Package root and Dart
package name are both Grounded; org is nya.

The enforcement engine, one unit per formula in utils/:

- DebtEngine      w(class) x severity(d) x decay(t), sublinear severity so old
                  misses cannot swamp the score; abandonment 2x with 30-day
                  decay immunity; late complete retains 30%
- StandingEngine  Good -> Warned -> Grounded -> Lockdown, derived not set;
                  Grounded replaces home with the overdue queue
- CapacityEngine  blocks over-scheduling against p50 of historically completed
                  minutes, with a learned per-category estimation multiplier
- IntegrityEngine session integrity, weekly volume, plyometric contact ceiling
                  and enforced recovery gaps
- ExcuseAnalyser  on-device excuse clustering plus the confrontation copy
- GuardrailEngine distress detection and rationed amnesty
- ToneEngine      all enforcement copy, so the tone cap lives in one place

CommitmentEvent is append-only and is the source of truth rather than the
status field, which is what makes honest history and excuse analysis possible.

Goals contain commitments via parentId, and a task can be run from a
full-screen runner that derives elapsed time from wall-clock so screen-off
cannot lose time. Backgrounding pauses the clock and is counted. The runner is
mirrored into an ongoing notification, with alarm-class full-screen intents
reserved for non-negotiables.

Design language, fonts, icon and native splash are in place; Mason bricks are
retargeted to this project and verified end-to-end.

flutter analyze lib/ reports no errors.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Mfu2gQLSFN21YRBcU2NrTt

frontend/lib/Grounded/about/internal/file/ConnectFileStorage.dart

@@ -0,0 +1,13 @@
+import 'dart:typed_data';
+
+abstract class ConnectFileStorage {
+  /// Persists proof bytes locally and returns the reference the completion
+  /// request carries.
+  Future<String> saveProof(String name, Uint8List bytes);
+
+  Future<Uint8List?> readProof(String reference);
+
+  Future<bool> deleteProof(String reference);
+
+  Future<String> proofDirectory();
+}

frontend/lib/Grounded/about/internal/file/FileStorage.dart

@@ -0,0 +1,53 @@
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:path_provider/path_provider.dart';
+
+import 'ConnectFileStorage.dart';
+
+class FileStorage implements ConnectFileStorage {
+  static const String proofFolder = "proof";
+
+  @override
+  Future<String> proofDirectory() async {
+    final Directory base = await getApplicationDocumentsDirectory();
+    final Directory folder = Directory("${base.path}/$proofFolder");
+
+    if (!await folder.exists()) {
+      await folder.create(recursive: true);
+    }
+
+    return folder.path;
+  }
+
+  @override
+  Future<String> saveProof(String name, Uint8List bytes) async {
+    final String folder = await proofDirectory();
+    final File file = File("$folder/$name");
+    await file.writeAsBytes(bytes);
+    return file.path;
+  }
+
+  @override
+  Future<Uint8List?> readProof(String reference) async {
+    final File file = File(reference);
+
+    if (!await file.exists()) {
+      return null;
+    }
+
+    return await file.readAsBytes();
+  }
+
+  @override
+  Future<bool> deleteProof(String reference) async {
+    final File file = File(reference);
+
+    if (!await file.exists()) {
+      return false;
+    }
+
+    await file.delete();
+    return true;
+  }
+}