[jdjioe5-cpu]

Resolves #58.

Summary

Adds comprehensive unit tests in contracts/kinlock/src/test/vault_tests.rs asserting exact second boundary transitions for lock releases and refunds as specified by Hard Rule 8 and issue #58:

• now == unlock_at - 1: release fails with Error::TrancheNotUnlocked.
• now == unlock_at: release succeeds.
• now == expires_at - 1: release succeeds, while refund fails with Error::RefundNotAllowed.
• now == expires_at: release fails with Error::LockExpired, while refund succeeds with RefundReason::Expired.
• Verified across single-tranche payee locks, two-tranche payee locks (partial release followed by expiry refund of remainder), and universal direct locks (create_direct_lock).

Roadmap update

Updated ROADMAP.md tracking M1-07 and M1-13 boundary tests with closes #58.

Verification

• cargo fmt --all -- --check: PASS
• cargo clippy --all-targets -- -D warnings: PASS
• cargo test --package kinlock: PASS (all 115 tests green)

Payout: USDC on base
Recipient address: 0xb5C01dc3d7878B6cc97511B079a7FAA18473453C