Add health check, backtest, correlation tracker, wallet setup, and skills registry

New scripts:
- health_check.py: one-command session-start workflow (portfolio + live prices +
  drawdown + stop losses → GREEN/YELLOW/RED status)
- backtest.py: performance analysis with live-readiness assessment against
  CLAUDE.md prerequisites (20+ trades, >55% win rate, Sharpe >0.5)
- correlation_tracker.py: detects hidden correlated exposure in portfolio
  (e.g., 3 insider-trading bets = one cluster)
- setup_wallet.py: burner wallet creation, env var verification, on-chain
  balance check for live trading setup

Also adds:
- .env.example template for live trading configuration
- .well-known/skills/index.json for Agent Skills registry discovery
- Updated SKILL.md files documenting new scripts
- .gitignore entries for .env, .polymarket-live/, and key files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

polymarket-live-executor/.env.example

@@ -0,0 +1,21 @@
+# Polymarket Live Trading — Environment Configuration
+# Copy this file to .env and fill in your values:
+#   cp .env.example .env && chmod 600 .env
+#
+# NEVER commit .env to version control.
+# NEVER use your main wallet. Create a dedicated burner wallet.
+
+# Required: Burner wallet private key (with 0x prefix)
+# Create one with: cast wallet new  OR  python -c "from eth_account import Account; a=Account.create(); print(f'Address: {a.address}\nKey: {a.key.hex()}')"
+POLYMARKET_PRIVATE_KEY=0x_YOUR_BURNER_WALLET_PRIVATE_KEY_HERE
+
+# Required: Safety gate — must be "true" for any trade to execute
+POLYMARKET_CONFIRM=true
+
+# Max dollars per trade (start small!)
+# First time: $5 | Learning: $10 | Experienced: $50 | Advanced: $200
+POLYMARKET_MAX_SIZE=5
+
+# Max daily loss before all trading halts
+# First time: $10 | Learning: $25 | Experienced: $100 | Advanced: $500
+POLYMARKET_DAILY_LOSS_LIMIT=10