fix: correct bugs in expense_analysis example

[Hupperich-Manuel]

Summary

Fix two bugs in examples/expense_analysis/data.py that prevented the example from running correctly.

Bug Fixes

1. get_expenses() - Wrong dictionary key

• Before: return {..., 'items': items}
• After: return {..., 'expenses': items}
• Reason: main.py line 56 calls expenses_data.get("expenses", []), so the key must be "expenses" not "items"

2. get_custom_budget() - Missing return statement

• Before: custom_budgets.get(user_id) (result was discarded)
• After: Added proper logic to return budget info or None

Testing

Ran python examples/expense_analysis/main.py and confirmed it now produces correct output:
{'total_team_members_analyzed': 5, 'count_exceeded_budget': 1, 'over_budget_details': [{'name': 'Carol Jones', 'total_spent': 6740.0, 'budget': 5000, 'amount_over': 1740.0}]}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[codspeed-hq]

Merging this PR will not alter performance

✅ 13 untouched benchmarks

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_{Comparing Hupperich-Manuel:fix/expense-analysis-example-bugs (edc2c8a) with main (fc2f154)}

[Embers-of-the-Fire]

works, lgtm