feat(block1): inventory walking skeleton + first quick-add slice

Stand up the Tanemaki monorepo and the first end-to-end vertical slice of
Block 1 (offline, encrypted inventory): add a seed → see it in a categorized,
searchable list → it persists → reopen and it's still there.

Architecture (state management like G1nkgo, adapted to Tane's reality):
- flutter_bloc (Cubit-first), but the encrypted Drift DB is the single source
  of truth; cubits stream from repositories (no hydrated_bloc/Hive, which would
  write plaintext at rest).
- get_it composition root; go_router; slang i18n (ES/EN, Weblate-friendly JSON).

Workspace & core:
- pub workspace: packages/commons_core (pure Dart) + apps/app_seeds (Flutter).
- commons_core primitives: UUIDv7 IdGen, Hybrid Logical Clock, Quantity value
  type (+ plant-aware QuantityKind), IdentityService root-seed stub.

Data & security:
- Drift schemaVersion=1 with all 10 Block-1 tables + common CRDT columns
  (HLC updated_at, last_author, tombstones); Movement append-only.
- SQLCipher via an injectable executor that refuses to open a plaintext DB;
  DB key + root seed in the OS keystore (separate secrets).
- Exported drift_schema_v1.json + migration scaffold.

Tests (near-TDD; nothing merges without tests):
- commons_core units (24), Drift migration test, "no plaintext at rest"
  security guard (runs where SQLCipher is present, skips otherwise),
  repository, widget, full quick-add flow, file-reopen persistence, and a
  no-hardcoded-strings i18n guard. GitLab CI: format + analyze + test + coverage.

Follow-on Block-1 stories (item detail/edit, species catalog, germination UI)
and all of Block 2 remain out of scope.

apps/app_seeds/test/ui/inventory_list_screen_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tane/db/database.dart';
+import 'package:tane/i18n/strings.g.dart';
+import 'package:tane/ui/inventory_list_screen.dart';
+
+import '../support/test_support.dart';
+
+void main() {
+  late AppDatabase db;
+
+  setUp(() => db = newTestDatabase());
+  tearDown(() => db.close());
+
+  testWidgets('shows the empty state when there are no seeds', (tester) async {
+    final repo = newTestRepository(db);
+    await tester.pumpWidget(
+      wrapScreen(repository: repo, child: const InventoryListScreen()),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.text('No seeds yet. Tap + to add your first.'), findsOneWidget);
+    await disposeTree(tester);
+  });
+
+  testWidgets(
+    'renders seeds from the repository grouped under their category',
+    (tester) async {
+      final repo = newTestRepository(db);
+      await repo.addQuickVariety(
+        label: 'Grandma tomato',
+        category: 'Solanaceae',
+      );
+
+      await tester.pumpWidget(
+        wrapScreen(repository: repo, child: const InventoryListScreen()),
+      );
+      await tester.pumpAndSettle();
+
+      expect(find.text('Grandma tomato'), findsOneWidget);
+      expect(find.text('Solanaceae'), findsOneWidget); // category header
+      await disposeTree(tester);
+    },
+  );
+
+  testWidgets('search filters the visible list', (tester) async {
+    final repo = newTestRepository(db);
+    await repo.addQuickVariety(label: 'Tomato');
+    await repo.addQuickVariety(label: 'Bean');
+
+    await tester.pumpWidget(
+      wrapScreen(repository: repo, child: const InventoryListScreen()),
+    );
+    await tester.pumpAndSettle();
+
+    await tester.enterText(find.byKey(const Key('inventory.search')), 'bea');
+    await tester.pumpAndSettle();
+
+    expect(find.text('Bean'), findsOneWidget);
+    expect(find.text('Tomato'), findsNothing);
+    await disposeTree(tester);
+  });
+
+  testWidgets('renders in Spanish when the locale is es', (tester) async {
+    final repo = newTestRepository(db);
+    await tester.pumpWidget(
+      wrapScreen(
+        repository: repo,
+        child: const InventoryListScreen(),
+        locale: AppLocale.es,
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    expect(find.text('Inventario'), findsOneWidget);
+    await disposeTree(tester);
+  });
+}

apps/app_seeds/test/ui/quick_add_flow_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:tane/app.dart';
+import 'package:tane/i18n/strings.g.dart';
+
+import '../support/test_support.dart';
+
+void main() {
+  testWidgets(
+    'quick-add: empty label errors; filling it saves and lists the seed',
+    (tester) async {
+      LocaleSettings.setLocaleSync(AppLocale.en);
+      final db = newTestDatabase();
+      addTearDown(db.close);
+      final repo = newTestRepository(db);
+
+      await tester.pumpWidget(
+        TranslationProvider(child: TaneApp(repository: repo)),
+      );
+      await tester.pumpAndSettle();
+
+      // Starts empty.
+      expect(
+        find.text('No seeds yet. Tap + to add your first.'),
+        findsOneWidget,
+      );
+
+      // Open the quick-add sheet.
+      await tester.tap(find.byKey(const Key('inventory.addFab')));
+      await tester.pumpAndSettle();
+
+      // Saving with an empty label surfaces the validation message.
+      await tester.tap(find.byKey(const Key('quickAdd.save')));
+      await tester.pumpAndSettle();
+      expect(find.text('Give it a name'), findsOneWidget);
+
+      // Enter a name and save.
+      await tester.enterText(
+        find.byKey(const Key('quickAdd.labelField')),
+        'Grandma tomato',
+      );
+      await tester.tap(find.byKey(const Key('quickAdd.save')));
+      await tester.pumpAndSettle();
+
+      // Sheet closed and the seed shows in the list.
+      expect(find.byKey(const Key('quickAdd.labelField')), findsNothing);
+      expect(find.text('Grandma tomato'), findsOneWidget);
+      await disposeTree(tester);
+    },
+  );
+}