[shobhamerabacha-star]

Summary

This PR adds comprehensive unit tests covering spending policy simulation helper functions, edge cases, timezone boundaries, zero spending limits, fee sufficiency, and concurrent policy evaluation.

Addressed Issue

Closes #423

Test Coverage Added

1. Policy Evaluation Helpers (policyEvaluation.test.ts):
   • Proposed transaction schema validation (positive amounts, non-finite checks, 56-char Stellar G-addresses, asset enums).
   • Policy configuration extraction (configFromPolicies) including disabled policy filtering and recipient allowlist parsing.
   • Fail-closed behavior when policy configurations are unconfigured or empty.
   • Exact transaction ceiling checks, daily velocity limits, department budget overflow, and recipient allow-list matching.
2. Policy Simulation Edge Cases (policySimulationEdgeCases.test.ts):
   • Spending-limit amount boundary classifications (within, at_limit, over, delta calculation).
   • Stellar asset code normalization and plaintext operation parser validation.
   • Low-balance wallet fee sufficiency and network fee depletion edge cases.
3. Simulation Boundary Extensions (spendingPolicySimulation.test.ts):
   • Timezone boundaries and execution time-window transitions across midnight UTC.
   • Zero spending limit and freeze policy enforcement.
   • Parallel concurrent policy evaluations across simulated agents without state contamination.

Verification

• 70/70 unit tests passing cleanly via npm test
• npm run typecheck passes with zero TypeScript errors
• npm run lint passes cleanly

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