docs: add cost tracking for Issue #120 implementation
Track session costs for fixing MarkiTect issue handling system:
- Session cost: €0.1656 ($0.1800 USD)
- Token usage: 30,000 tokens (22K input, 8K output)
- Implementation scope: Configuration integration, API endpoints, domain mapping, presentation fixes
- Deliverables: 4 files modified, full read operations restored, Issue #121 created for pagination
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Co-Authored-By: Claude <noreply@anthropic.com>