Automate local JoinQuant smoke prep

docs/joinquant_comparison_plugin.md

@@ -225,6 +225,19 @@ files and wrapper to JoinQuant, run the JoinQuant backtest, export fills,
 positions, and PnL, then run ingest and reconcile. Start with one or two days
 before expanding the sample.
 
+For the first one-stock long-only smoke test, the local side can be prepared in
+one command:
+
+```bash
+uv run python cli.py joinquant prepare-smoke \
+  --out-dir /tmp/chinese-equity-quant-realdata
+```
+
+The command downloads a tiny public daily-bar sample, builds a fixed-share
+`sh600000` long-only position file, simulates it internally, exports aligned
+JoinQuant target files, writes a configured wrapper strategy, and creates
+`joinquant_smoke_manifest.json` with all output paths.
+
 ## Recommended First Sanity Checks
 
 1. One liquid stock with a fixed target share count.