feat(memory): migrate EmbeddingProvider to KMP-compatible TextEmbeddingExecutor, add :memory-md-vector, and hybrid backend support

- Replaced `EmbeddingProvider` with cross-platform `TextEmbeddingExecutor` for native target compatibility.
- Introduced `:memory-md-vector` module combining vector-cache and `.md` file-based memory systems (`hybrid` backend).
- Updated `SiglipEmbeddingProvider` to use KMP `TextEmbeddingExtractor` and streamlined compatibility via `asExecutor`.
- Added hybrid memory backend to `standalone`, supporting `.md` reconciliation with vector-cache for semantic

settings.gradle.kts

@@ -91,6 +91,10 @@ include(":outbox-api")
 // eviction. Для тестов, dev-режима, embedded-сценариев (Android core).
 include(":outbox-inmemory")
 include(":journal-inmemory")
+// Гибридное хранилище памяти: .md файлы (single source of truth) +
+// ksqlite vector-кэш (sqlite-vec vec0) + reconcile + hybrid search.
+// Заменяет чисто-keyword :memory-md там, где нужен семантический поиск.
+include(":memory-md-vector")
 //include(":event-store-in-memory")
 //include(":working-memory-api")
 include(":storage-inmemory")