[Test] Add Boundary Test Case for Max Budget Percentage in Budget Remaining Test Suite

• Labels: good first issue, testing, difficulty:beginner, area:core
• Target File: tests/budget-remaining.test.ts
• Estimated Time: 10–15 minutes
• Difficulty: Level 2 (Beginner)

Why This Matters

Financial budget tracking in PACT OS must handle exact 100% budget consumption boundary conditions without rounding errors, negative zero artifacts, or unexpected status calculation exceptions.

Current Behavior

tests/budget-remaining.test.ts verifies basic budget allocations, but does not explicitly test the exact 100% spent boundary condition.

Requested Change

Add a unit test case in tests/budget-remaining.test.ts asserting that when total expense equals total budget, remainingCents equals 0 and percentageUsed equals 100 cleanly.

Acceptance Criteria

• 100% budget utilization boundary test case added to tests/budget-remaining.test.ts.
• Test suite executes cleanly offline: npm run test:file -- tests/budget-remaining.test.ts.

Verification

npm run test:file -- tests/budget-remaining.test.ts

Contributor Notes

Single test case addition.

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Start with tests/budget-remaining.test.ts and review the existing budget allocation cases. Add a case where total expense equals total budget, then run npm run test:file -- tests/budget-remaining.test.ts and confirm remainingCents is 0 and percentageUsed is 100.