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/external/data/GroundedError.dart

@@ -0,0 +1,45 @@
+import 'Severity.dart';
+
+class GroundedError {
+  double code;
+  String message;
+  String helper;
+  String title;
+  String severity;
+
+  GroundedError(
+      {required this.code,
+      required this.message,
+      required this.helper,
+      required this.title,
+      required this.severity});
+
+  factory GroundedError.fromJson(Map<String, dynamic> json) {
+    return GroundedError(
+      code: json['code'],
+      message: json['message'],
+      helper: json['helper'],
+      title: json['title'],
+      severity: json['severity'],
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    final Map<String, dynamic> data = <String, dynamic>{};
+    data['code'] = code;
+    data['message'] = message;
+    data['helper'] = helper;
+    data['title'] = title;
+    data['severity'] = severity;
+    return data;
+  }
+
+  Severity getSeverityEnum(String severityString) {
+    for (Severity severity in Severity.values) {
+      if (severityString == severity.name) {
+        return severity;
+      }
+    }
+    return Severity.error;
+  }
+}