Add unit tests for the token expiry validator correctly computing the expiry timestamp from the issued-at claim

[Chucks1093]

Summary

The token expiry validator computes the expected expiry as iat + ttlSeconds and rejects tokens where exp does not match. Unit tests should confirm the validator accepts tokens with a matching expiry and rejects those where exp has been tampered with.

Scope

• Test a token where exp === iat + ttl passes validation
• Test a token where exp > iat + ttl fails with token_expiry_tampered
• Test a token where exp < iat + ttl fails with token_expiry_tampered
• Test a token with no iat claim fails with missing_iat

Acceptance Criteria

• Correct exp passes validation
• Extended exp fails with token_expiry_tampered
• Shortened exp fails with token_expiry_tampered
• Missing iat fails with missing_iat

ETA: 12 hours

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