refactor: split memory manager internals

src/memory/sqlite-vec.ts

@@ -0,0 +1,25 @@
+import type { DatabaseSync } from "node:sqlite";
+
+export async function loadSqliteVecExtension(params: {
+  db: DatabaseSync;
+  extensionPath?: string;
+}): Promise<{ ok: boolean; extensionPath?: string; error?: string }> {
+  try {
+    const sqliteVec = await import("sqlite-vec");
+    const resolvedPath = params.extensionPath?.trim() ? params.extensionPath.trim() : undefined;
+    const extensionPath = resolvedPath ?? sqliteVec.getLoadablePath();
+
+    params.db.enableLoadExtension(true);
+    if (resolvedPath) {
+      params.db.loadExtension(extensionPath);
+    } else {
+      sqliteVec.load(params.db);
+    }
+
+    return { ok: true, extensionPath };
+  } catch (err) {
+    const message = err instanceof Error ? err.message : String(err);
+    return { ok: false, error: message };
+  }
+}
+