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/lib/state/inventory_cubit.dart

@@ -0,0 +1,62 @@
+import 'dart:async';
+
+import 'package:equatable/equatable.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+
+import '../data/variety_repository.dart';
+
+/// Inventory list state: all items from the DB plus the current search query.
+/// [visibleItems] applies the query; grouping by category is done in the UI.
+class InventoryState extends Equatable {
+  const InventoryState({
+    this.items = const [],
+    this.query = '',
+    this.loading = true,
+  });
+
+  final List<VarietyListItem> items;
+  final String query;
+  final bool loading;
+
+  List<VarietyListItem> get visibleItems {
+    if (query.trim().isEmpty) return items;
+    final q = query.toLowerCase();
+    return items.where((i) => i.label.toLowerCase().contains(q)).toList();
+  }
+
+  InventoryState copyWith({
+    List<VarietyListItem>? items,
+    String? query,
+    bool? loading,
+  }) {
+    return InventoryState(
+      items: items ?? this.items,
+      query: query ?? this.query,
+      loading: loading ?? this.loading,
+    );
+  }
+
+  @override
+  List<Object?> get props => [items, query, loading];
+}
+
+/// Subscribes to the repository's reactive inventory stream. The list updates
+/// automatically after a quick-add — no manual refresh.
+class InventoryCubit extends Cubit<InventoryState> {
+  InventoryCubit(this._repo) : super(const InventoryState()) {
+    _sub = _repo.watchInventory().listen(
+      (items) => emit(state.copyWith(items: items, loading: false)),
+    );
+  }
+
+  final VarietyRepository _repo;
+  late final StreamSubscription<List<VarietyListItem>> _sub;
+
+  void search(String query) => emit(state.copyWith(query: query));
+
+  @override
+  Future<void> close() async {
+    await _sub.cancel();
+    return super.close();
+  }
+}