fix(memory): support symlinks in memory file discovery

walkDir now follows symbolic links using fs.stat() to determine if
the target is a file or directory. This enables:

- Symlinked markdown files inside memory/ to be indexed
- Symlinked directories inside memory/ to be traversed
- Graceful handling of dangling symlinks (silently skipped)

Fixes an issue where dirent.isFile() returned false for symlinks,
causing them to be excluded from memory search indexing.

Cross-platform notes:
- Works on Linux/macOS/Windows (symlink support varies by platform)
- Windows may require elevated permissions to create symlinks,
  but reading existing symlinks works without special privileges

src/memory/internal.test.ts

@@ -1,6 +1,73 @@
+import fs from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
 import { describe, expect, it } from "vitest";
 
-import { chunkMarkdown } from "./internal.js";
+import { chunkMarkdown, listMemoryFiles } from "./internal.js";
+
+async function makeTempDir(prefix = "moltbot-memory-test-"): Promise<string> {
+  return fs.mkdtemp(path.join(os.tmpdir(), prefix));
+}
+
+describe("listMemoryFiles", () => {
+  it("includes symlinked markdown files", async () => {
+    const tempDir = await makeTempDir();
+    const memoryDir = path.join(tempDir, "memory");
+    await fs.mkdir(memoryDir);
+
+    // Create a real file outside memory/
+    const realFile = path.join(tempDir, "notes.md");
+    await fs.writeFile(realFile, "# Notes\nSome content");
+
+    // Create a symlink inside memory/ pointing to the real file
+    const symlinkPath = path.join(memoryDir, "linked-notes.md");
+    await fs.symlink(realFile, symlinkPath);
+
+    const files = await listMemoryFiles(tempDir);
+    expect(files).toContain(symlinkPath);
+
+    // Cleanup
+    await fs.rm(tempDir, { recursive: true });
+  });
+
+  it("includes files inside symlinked directories", async () => {
+    const tempDir = await makeTempDir();
+    const memoryDir = path.join(tempDir, "memory");
+    await fs.mkdir(memoryDir);
+
+    // Create a real directory with a markdown file outside memory/
+    const realDir = path.join(tempDir, "external-notes");
+    await fs.mkdir(realDir);
+    await fs.writeFile(path.join(realDir, "doc.md"), "# Doc");
+
+    // Create a symlinked directory inside memory/
+    const symlinkDir = path.join(memoryDir, "linked-dir");
+    await fs.symlink(realDir, symlinkDir);
+
+    const files = await listMemoryFiles(tempDir);
+    expect(files).toContain(path.join(symlinkDir, "doc.md"));
+
+    // Cleanup
+    await fs.rm(tempDir, { recursive: true });
+  });
+
+  it("skips dangling symlinks gracefully", async () => {
+    const tempDir = await makeTempDir();
+    const memoryDir = path.join(tempDir, "memory");
+    await fs.mkdir(memoryDir);
+
+    // Create a symlink pointing to a non-existent file
+    const danglingSymlink = path.join(memoryDir, "dangling.md");
+    await fs.symlink("/non/existent/path.md", danglingSymlink);
+
+    // Should not throw and should return empty (no valid files)
+    const files = await listMemoryFiles(tempDir);
+    expect(files).not.toContain(danglingSymlink);
+
+    // Cleanup
+    await fs.rm(tempDir, { recursive: true });
+  });
+});
 
 describe("chunkMarkdown", () => {
   it("splits overly long lines into max-sized chunks", () => {

src/memory/internal.ts

@@ -50,11 +50,27 @@ async function walkDir(dir: string, files: string[]) {
   const entries = await fs.readdir(dir, { withFileTypes: true });
   for (const entry of entries) {
     const full = path.join(dir, entry.name);
-    if (entry.isDirectory()) {
+
+    let isDir = entry.isDirectory();
+    let isFile = entry.isFile();
+
+    // For symlinks, resolve the target type via fs.stat (follows symlink)
+    if (entry.isSymbolicLink()) {
+      try {
+        const stat = await fs.stat(full);
+        isDir = stat.isDirectory();
+        isFile = stat.isFile();
+      } catch {
+        // Dangling symlink or inaccessible target - skip silently
+        continue;
+      }
+    }
+
+    if (isDir) {
       await walkDir(full, files);
       continue;
     }
-    if (!entry.isFile()) continue;
+    if (!isFile) continue;
     if (!entry.name.endsWith(".md")) continue;
     files.push(full);
   }