feat(client): throwaway narrate harness scene + live-smoke doc

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/docs/README.md

@@ -11,3 +11,21 @@ Put here:
 - HTTP client + fallback-degradation handling (§13)
 
 Cross-cutting design (anything touching both client and api) goes in the root [`/docs`](../../docs), not here.
+
+## Narrate live smoke (M2 client HTTP loop)
+
+The `narrate_harness` scene is a throwaway proof of the client → `/dm/narrate`
+loop. It is not the game UI.
+
+**Prereqs:** the proxy running and Ollama reachable.
+
+1. Start the proxy: from `api/`, `uvicorn app.main:app --port 8000` (with the
+   `.env` from `.env.example`; Ollama up at `OLLAMA_BASE_URL`).
+2. In the Godot editor, open `res://scenes/narrate_harness.tscn` and run it (F6).
+3. Click **Narrate this scene**. Expect grounded prose in the Narrator's voice
+   (referencing Greywater / Brannoc / the washed-out bridge), tags stripped, and
+   `facts harvested: N` with N ≥ 0.
+4. **Degraded path:** stop the proxy and click again. Expect the authored
+   fallback line and `(degraded)` in the status — never an error.
+
+Override the proxy URL with the `coc_rpg/proxy_base_url` project setting.