fix: split long memory lines

src/memory/internal.test.ts

@@ -0,0 +1,16 @@
+import { describe, expect, it } from "vitest";
+
+import { chunkMarkdown } from "./internal.js";
+
+describe("chunkMarkdown", () => {
+  it("splits overly long lines into max-sized chunks", () => {
+    const chunkTokens = 400;
+    const maxChars = chunkTokens * 4;
+    const content = "a".repeat(maxChars * 3 + 25);
+    const chunks = chunkMarkdown(content, { tokens: chunkTokens, overlap: 0 });
+    expect(chunks.length).toBeGreaterThan(1);
+    for (const chunk of chunks) {
+      expect(chunk.text.length).toBeLessThanOrEqual(maxChars);
+    }
+  });
+});