📄 Nightly docs drift

[github-actions]

Nightly documentation drift detected

Code changed in the last 24 hours without a matching update to living docs:

• core/integrations/market/market_trends.py
• core/integrations/market/rentometer.py
• core/services/capex.py
• core/services/exit_strategy.py
• core/services/financing_comparison.py
• core/services/portfolio.py
• core/services/screening.py
• core/services/sensitivity.py
• investor_app/finance/utils.py

Update docs/API_SURFACE.md and/or docs/CHANGE_IMPACT_MAP.md if the public API or documented impact changed.