feat(memory): add explicit paths config for memory search

Add a `paths` option to `memorySearch` config, allowing users to
explicitly specify additional directories or files to include in
memory search.

Follow-up to #2961 as suggested by @gumadeiras — instead of auto-following
symlinks (which has security implications), users can now explicitly
declare additional search paths.

- Add `memorySearch.paths` config option (array of strings)
- Paths can be absolute or relative (resolved from workspace)
- Directories are recursively scanned for `.md` files
- Single `.md` files can also be specified
- Paths from defaults and agent overrides are merged
- Added 4 test cases for listMemoryFiles

src/memory/internal.test.ts

@@ -1,6 +1,70 @@
-import { describe, expect, it } from "vitest";
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
 
-import { chunkMarkdown } from "./internal.js";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+
+import { chunkMarkdown, listMemoryFiles } from "./internal.js";
+
+describe("listMemoryFiles", () => {
+  let tmpDir: string;
+
+  beforeEach(async () => {
+    tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), "memory-test-"));
+  });
+
+  afterEach(async () => {
+    await fs.rm(tmpDir, { recursive: true, force: true });
+  });
+
+  it("includes files from additional paths (directory)", async () => {
+    // Create default memory file
+    await fs.writeFile(path.join(tmpDir, "MEMORY.md"), "# Default memory");
+
+    // Create additional directory with files
+    const extraDir = path.join(tmpDir, "extra-notes");
+    await fs.mkdir(extraDir, { recursive: true });
+    await fs.writeFile(path.join(extraDir, "note1.md"), "# Note 1");
+    await fs.writeFile(path.join(extraDir, "note2.md"), "# Note 2");
+    await fs.writeFile(path.join(extraDir, "ignore.txt"), "Not a markdown file");
+
+    const files = await listMemoryFiles(tmpDir, [extraDir]);
+    expect(files).toHaveLength(3); // MEMORY.md + 2 notes
+    expect(files.some((f) => f.endsWith("MEMORY.md"))).toBe(true);
+    expect(files.some((f) => f.endsWith("note1.md"))).toBe(true);
+    expect(files.some((f) => f.endsWith("note2.md"))).toBe(true);
+    expect(files.some((f) => f.endsWith("ignore.txt"))).toBe(false);
+  });
+
+  it("includes files from additional paths (single file)", async () => {
+    await fs.writeFile(path.join(tmpDir, "MEMORY.md"), "# Default memory");
+    const singleFile = path.join(tmpDir, "standalone.md");
+    await fs.writeFile(singleFile, "# Standalone");
+
+    const files = await listMemoryFiles(tmpDir, [singleFile]);
+    expect(files).toHaveLength(2);
+    expect(files.some((f) => f.endsWith("standalone.md"))).toBe(true);
+  });
+
+  it("handles relative paths in additional paths", async () => {
+    await fs.writeFile(path.join(tmpDir, "MEMORY.md"), "# Default memory");
+    const extraDir = path.join(tmpDir, "subdir");
+    await fs.mkdir(extraDir, { recursive: true });
+    await fs.writeFile(path.join(extraDir, "nested.md"), "# Nested");
+
+    // Use relative path
+    const files = await listMemoryFiles(tmpDir, ["subdir"]);
+    expect(files).toHaveLength(2);
+    expect(files.some((f) => f.endsWith("nested.md"))).toBe(true);
+  });
+
+  it("ignores non-existent additional paths", async () => {
+    await fs.writeFile(path.join(tmpDir, "MEMORY.md"), "# Default memory");
+
+    const files = await listMemoryFiles(tmpDir, ["/does/not/exist"]);
+    expect(files).toHaveLength(1);
+  });
+});
 
 describe("chunkMarkdown", () => {
   it("splits overly long lines into max-sized chunks", () => {