feat: copy-trading replay & comparison system

CLAUDE.md

@@ -14,7 +14,7 @@ Forked from [agent-next/polymarket-paper-trader](https://github.com/agent-next/p
 # Install
 pip install -e ".[dev]"
 
-# Tests (615 non-live + 42 live = 657 total, 100% coverage)
+# Tests (791 non-live + 44 live = 835 total, 100% coverage)
 python3 -m pytest tests/ -x -q -m "not live"            # fast, skip live API tests
 python3 -m pytest tests/ -v                              # verbose
 python3 -m pytest tests/ --cov=pm_trader --cov-report=term-missing  # coverage
@@ -24,9 +24,15 @@ python3 -m pytest tests/test_e2e_live.py -v              # live API (requires ne
 python3 -m pytest tests/test_engine.py -x -q             # one file
 python3 -m pytest tests/test_engine.py::TestBuy::test_buy_yes -x -q  # one test
 
-# Run
+# Run (first time only — do NOT re-run init if account already exists, it resets cash)
 pm-trader init --balance 10000
 pm-trader-mcp                                            # MCP server on stdio
+
+# Dev (frontend + backend with auto-reload, no init needed)
+pm-trader web --port 8000 --reload                       # backend API (FastAPI + Uvicorn)
+cd frontend && npm install && npm run dev                 # frontend (Vite + React, port 5173)
+# Frontend proxies /api → http://127.0.0.1:8000
+# Open http://localhost:5173 for the dashboard
 ```
 
 ## Architecture