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/flutter_test_config.dart

@@ -0,0 +1,23 @@
+import 'dart:async';
+import 'dart:ffi';
+import 'dart:io';
+
+import 'package:sqlite3/open.dart';
+
+/// Host test setup: point package:sqlite3 at the system SQLite so in-memory
+/// Drift databases (migration/widget tests) load on Linux CI/dev machines,
+/// where only `libsqlite3.so.0` may be present. The encrypted executor
+/// overrides its own isolate to SQLCipher separately, so this does not affect
+/// the on-disk encryption tests.
+Future<void> testExecutable(FutureOr<void> Function() testMain) async {
+  if (Platform.isLinux) {
+    open.overrideFor(OperatingSystem.linux, () {
+      try {
+        return DynamicLibrary.open('libsqlite3.so');
+      } on ArgumentError {
+        return DynamicLibrary.open('libsqlite3.so.0');
+      }
+    });
+  }
+  await testMain();
+}