Fix build errors

docs/concepts/memory.md

@@ -109,6 +109,13 @@ out to QMD for retrieval. Key points:
   a release) and make sure the `qmd` binary is on the gateway’s `PATH`.
 - QMD needs an SQLite build that allows extensions (`brew install sqlite` on
   macOS). The gateway sets `INDEX_PATH`/`QMD_CONFIG_DIR` automatically.
+- QMD shells out to its CLI, which depends on an Ollama daemon listening on
+  `http://localhost:11434` to load the bundled models (`embeddinggemma`,
+  `ExpedientFalcon/qwen3-reranker:0.6b-q8_0`, `qwen3:0.6b`). Install/run Ollama
+  separately before enabling the backend.
+- OS support: macOS and Linux work out of the box once Bun + SQLite + Ollama are
+  installed. Windows requires WSL2 (or building the experimental Ollama port)
+  until Ollama ships native binaries.
 
 **How the sidecar runs**
 - The gateway writes a self-contained QMD home under