docs: update README and runbook for broker-synced reset, confidence dampener, paper account workflow

docs/notes/runbook.md

@@ -132,6 +132,33 @@ curl -X PUT https://stonks-trading.celestium.life/api/trading/config \
   -d '{"enabled": true}'
 ```
 
+### Full paper trading reset
+Liquidates all Alpaca positions, cancels open orders, wipes all local trading state (decisions, orders, positions, snapshots, backtests), and sets engine capital from the broker's actual account balance.
+
+```bash
+# Reset and sync capital from broker
+curl -X POST https://stonks-trading.celestium.life/api/trading/reset \
+  -H 'Content-Type: application/json' \
+  -d '{}'
+
+# Or override with a specific capital amount
+curl -X POST https://stonks-trading.celestium.life/api/trading/reset \
+  -H 'Content-Type: application/json' \
+  -d '{"initial_capital": 100000}'
+```
+
+Note: if the market is closed, Alpaca liquidation orders will be queued and fill at next market open. The engine capital is set immediately.
+
+### Switching to a new Alpaca paper account
+Alpaca allows up to 3 paper accounts. To start fresh:
+1. Go to https://app.alpaca.markets
+2. Click paper account number → "Open New Paper Account"
+3. Generate new API keys
+4. Update secrets on gremlin-1: `alpaca.key`, `alpaca.secret`, `alpaca.url`
+5. Re-run `runmefirst.sh` or `helm upgrade` with new `--set` values
+6. Restart broker-adapter: `kso rollout restart deployment/broker-adapter`
+7. Hit the reset endpoint to sync engine state with the new account
+
 ### Check recent trading decisions
 ```bash
 curl -s https://stonks-api.celestium.life/api/trading/decisions?limit=10