docs: add custom memory endpoint example

docs/concepts/memory.md

@@ -149,3 +149,28 @@ Local mode:
 - When `memorySearch.provider = "local"`, `node-llama-cpp` resolves `modelPath`; if the GGUF is missing it **auto-downloads** to the cache (or `local.modelCacheDir` if set), then loads it. Downloads resume on retry.
 - Native build requirement: run `pnpm approve-builds`, pick `node-llama-cpp`, then `pnpm rebuild node-llama-cpp`.
 - Fallback: if local setup fails and `memorySearch.fallback = "openai"`, we automatically switch to remote embeddings (`openai/text-embedding-3-small` unless overridden) and record the reason.
+
+### Custom OpenAI-compatible endpoint example
+
+```json5
+agents: {
+  defaults: {
+    memorySearch: {
+      provider: "openai",
+      model: "text-embedding-3-small",
+      remote: {
+        baseUrl: "https://api.example.com/v1/",
+        apiKey: "YOUR_REMOTE_API_KEY",
+        headers: {
+          "X-Organization": "org-id",
+          "X-Project": "project-id"
+        }
+      }
+    }
+  }
+}
+```
+
+Notes:
+- `remote.*` takes precedence over `models.providers.openai.*`.
+- `remote.headers` merge with OpenAI headers; remote wins on key conflicts. Omit `remote.headers` to use the OpenAI defaults.