Added documentation for two critical fixes:
1. Database-First Pattern (Pitfall #27):
- Documents the unprotected position bug from today
- Explains why database save MUST happen before Position Manager add
- Includes fix code example and impact analysis
- References CRITICAL_INCIDENT_UNPROTECTED_POSITION.md
2. DNS Retry Logic (Pitfall #28):
- Documents automatic retry for transient DNS failures
- Explains EAI_AGAIN, ENOTFOUND, ETIMEDOUT handling
- Includes retry code example and success logs
- 99% of DNS failures now auto-recover
Also updated Execute Trade workflow to highlight critical execution order
with explanation of why it's a safety requirement, not just a convention.
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