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/bricks/mvvc_template/brick.yaml

@@ -0,0 +1,38 @@
+name: mvvc_template
+description: A new brick created with the Mason CLI.
+
+# The following defines the brick repository url.
+# Uncomment and update the following line before publishing the brick.
+# repository: https://github.com/my_org/my_repo
+
+# The following defines the version and build number for your brick.
+# A version number is three numbers separated by dots, like 1.2.34
+# followed by an optional build number (separated by a +).
+version: 0.1.0+1
+
+# The following defines the environment for the current brick.
+# It includes the version of mason that the brick requires.
+environment:
+  mason: ^0.1.1
+
+# Variables specify dynamic values that your brick depends on.
+# Zero or more variables can be specified for a given brick.
+# Each variable has:
+#  * a type (string, number, boolean, enum, array, or list)
+#  * an optional short description
+#  * an optional default value
+#  * an optional list of default values (array only)
+#  * an optional prompt phrase used when asking for the variable
+#  * a list of values (enums only)
+#  * an optional separator (list only)
+vars:
+  project:
+    type: string
+    description: The project name
+    default: Grounded
+    prompt: What is your project name?
+  screen:
+    type: string
+    description: The name of the new screen
+    default: ActivityNew
+    prompt: What is your file name?