feat: initial polymarket copy trade tool

- Watcher: polls Data API for trader activity
- Executor: buy/sell with market orders + retry logic
- Position manager: JSON-based state tracking
- Auto-sell: limit orders at profit target
- Redeemer: check & redeem winning positions on-chain
- Config: env-based settings with validation
- DRY_RUN mode for safe testing

.env.example

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+# Wallet
+PRIVATE_KEY=0xYOUR_PRIVATE_KEY_HERE
+WALLET_ADDRESS=0xYOUR_WALLET_ADDRESS_HERE
+
+# Polymarket API Credentials (optional, auto-derived if not set)
+CLOB_API_KEY=
+CLOB_API_SECRET=
+CLOB_API_PASSPHRASE=
+
+# Trader to Copy
+TRADER_ADDRESS=0xTRADER_ADDRESS_TO_COPY
+
+# Trade Sizing
+# "percentage" = % of trader's trade size, "balance" = % of own balance
+SIZE_MODE=percentage
+SIZE_PERCENT=50
+MIN_TRADE_SIZE=1
+
+# Auto Sell
+AUTO_SELL_ENABLED=true
+AUTO_SELL_PROFIT_PERCENT=10
+
+# Sell Mode when copying trader's sell
+# "market" = sell at market price, "limit" = sell at trader's avg sell price
+SELL_MODE=market
+
+# Polling Intervals (in seconds)
+POLL_INTERVAL=15
+REDEEM_INTERVAL=60
+
+# Dry Run (set to true to simulate without executing trades)
+DRY_RUN=true