test: add regression coverage for RiskScoreWeights failure handling

[priscannanna85-lgtm]

Overview

This PR adds focused regression coverage for the RiskScoreWeights failure path in src/aml/riskScoreEngine.ts, where a dual-control confirmation is required before risk weights can be changed. It exercises the thrown error contract, the neighboring success path, and boundary inputs, and makes the failure behavior deterministic and observable.

Related Issue

Changes

🧪 RiskScoreWeights regression coverage

• [MODIFY] src/aml/riskScoreEngine.ts

  • Ensured the dual-control failure branch is reachable and deterministic so it can be asserted in tests, while preserving the existing public contract (same error message and thrown Error type).

• [ADD] src/aml/riskScoreEngine.test.ts

  • Regression test asserting that changing risk weights without dual-control confirmation throws Error('Dual-control confirmation is required to change risk weights').
  • Success-path test asserting that a valid, confirmed weight change is applied and returned as expected.
  • Boundary tests covering edge inputs (e.g. empty/zero/limit weight values) to confirm the branch behavior stays observable and stable.

Verification Results

npm test -- src/aml/riskScoreEngine.test.ts
✅ focused suite passed

npm test
✅ surrounding suite passed

Acceptance Criteria	Status
Cover the named behavior with focused automated tests, including success and failure paths	✅ Failure (dual-control required) and success (confirmed change) paths covered
Preserve the existing public contract	✅ Same error type/message and return shape retained
Make error and boundary behavior observable and deterministic	✅ Explicit assertions on thrown error and boundary inputs

Closes #960

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