feat: complete test suite for GrantStreamEscrow

[LELOUCH-Vii]

Closes #13

Test coverage

• Deployment – USDC address storage, initial state, zero-address revert
• Grant Creation – field storage, ID increment, milestone init, event emission, input validation
• Grant Funding – funded flag, USDC transfer, event, access control, double-fund prevention
• Milestone Submission – happy path, resubmission after rejection, access control, all revert cases
• Verifier Approval – fund release, event emission, paidAmount tracking, sequential approvals, access control
• Verifier Rejection – status update, no fund leak, reject→resubmit→approve flow, access control
• View Functions – getMilestone, getMilestoneCount, grants mapping
• Multi-Grant Isolation – separate grants don't interfere with each other's state or funds
• Security – attacker vectors, self-approval prevention, funds locked until approval

#Testing
All 70 tests pass with npx hardhat test.

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Project	Deployment	Actions	Updated (UTC)
grant-stream	Ready	Preview, Comment	Jun 5, 2026 10:22am