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/utils/Thresholds.dart

@@ -0,0 +1,39 @@
+/// Configurable limits with sane defaults. These are the dials the user is
+/// allowed to turn — everything else about enforcement is fixed.
+class Thresholds {
+  /// Hard cap on unresolved overdue items.
+  static const int maxOpenOverdue = 5;
+
+  /// After this, a task cannot be deferred again — only completed or
+  /// explicitly abandoned.
+  static const int maxDeferralsPerTask = 2;
+
+  /// Minimum excuse length. Free text, no template buttons; the friction is
+  /// the point.
+  static const int minExcuseLength = 15;
+
+  /// Standing thresholds on the debt score.
+  static const double warnedThreshold = 12;
+  static const double groundedThreshold = 30;
+  static const double lockdownThreshold = 60;
+
+  /// Missed non-negotiables that force Grounded regardless of score.
+  static const int nonNegotiableMissesForGrounded = 3;
+
+  /// Amnesty tokens granted per month.
+  static const int amnestyTokensPerMonth = 3;
+
+  /// Capacity check headroom — plan against 85% of what you historically get
+  /// done, not 100%.
+  static const double capacityHeadroom = 0.85;
+
+  /// Days after which an untouched elective auto-archives.
+  static const int electiveArchiveDays = 21;
+
+  /// Snooze tax: each snooze shortens the next interval instead of extending
+  /// it, and the third becomes a full-screen alarm.
+  static const List<int> snoozeLadderMinutes = <int>[10, 5, 2];
+
+  /// Minutes a push can go unacknowledged before SMS fallback fires.
+  static const int smsFallbackMinutes = 20;
+}