[Developer] #204 Phase 1 MVP — Flutter app skeleton complete

- Drift 21 tables (8 catalog + 11 user + habit_dose_variants + meta_kv)
  with R1~R10 CHECK constraints and 19 indexes
- 8 hand-crafted seed JSON catalogs in app/assets/seed/
  (refs 84, protocols 34, methodologies 21, frame_patterns 30,
   reward_menu_items 30, break_protocols 8, common_frames 5, diet_patterns 5)
- 6 domain functions: recommend_variant, compute_streak,
  validate_frame_level, active_habit_quota, weekly_minimum_ratio,
  seed_importer (transactional, idempotent)
- 4 vertical-slice Riverpod screens: HabitList, HabitCreate, CheckIn, Streak
- 31 unit tests passing; flutter analyze clean
- OQ-5 streak semantics: missing entry ≠ explicit blank
  (missing = end of history; only TrackerValue.blank triggers Never-miss-twice)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/test/domain/streak/weekly_minimum_ratio_test.dart

@@ -0,0 +1,81 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:life_helper/domain/models/habit.dart';
+import 'package:life_helper/domain/models/tracker_entry.dart';
+import 'package:life_helper/domain/streak/weekly_minimum_ratio.dart';
+
+HabitDoseVariantModel _v(String id, {bool isMin = false}) =>
+    HabitDoseVariantModel(
+      variantId: id,
+      habitId: 'hb',
+      label: id,
+      doseText: '1x',
+      isMinimum: isMin,
+    );
+
+TrackerEntryModel _done(String date, {String? vId}) => TrackerEntryModel(
+      id: 'te_$date',
+      habitId: 'hb',
+      date: date,
+      value: TrackerValue.done,
+      variantId: vId,
+    );
+
+void main() {
+  final variantsById = {
+    'min': _v('min', isMin: true),
+    'full': _v('full'),
+  };
+
+  test('no done entries → ratio 0.0', () {
+    final r = computeWeeklyMinimumRatio(
+      entries: const [],
+      variantsById: variantsById,
+      asOf: DateTime(2026, 6, 11),
+    );
+    expect(r.totalDone, 0);
+    expect(r.ratio, 0.0);
+  });
+
+  test('3 of 4 used minimum → 0.75', () {
+    final r = computeWeeklyMinimumRatio(
+      entries: [
+        _done('2026-06-08', vId: 'min'),
+        _done('2026-06-09', vId: 'min'),
+        _done('2026-06-10', vId: 'full'),
+        _done('2026-06-11', vId: 'min'),
+      ],
+      variantsById: variantsById,
+      asOf: DateTime(2026, 6, 11),
+    );
+    expect(r.totalDone, 4);
+    expect(r.minimumUsed, 3);
+    expect(r.ratio, closeTo(0.75, 1e-9));
+  });
+
+  test('out-of-window entries are excluded', () {
+    final r = computeWeeklyMinimumRatio(
+      entries: [
+        _done('2026-06-01', vId: 'min'), // 10 days before asOf
+        _done('2026-06-11', vId: 'min'),
+      ],
+      variantsById: variantsById,
+      asOf: DateTime(2026, 6, 11),
+    );
+    expect(r.totalDone, 1);
+    expect(r.minimumUsed, 1);
+  });
+
+  test('done with null variantId counts as totalDone but not minimumUsed', () {
+    final r = computeWeeklyMinimumRatio(
+      entries: [
+        _done('2026-06-10'),
+        _done('2026-06-11', vId: 'min'),
+      ],
+      variantsById: variantsById,
+      asOf: DateTime(2026, 6, 11),
+    );
+    expect(r.totalDone, 2);
+    expect(r.minimumUsed, 1);
+    expect(r.ratio, 0.5);
+  });
+}