fix(config): correct maxLeaseRenewalThreads validation to match error message

[abhu85]

Summary

Fix off-by-one validation bug in withMaxLeaseRenewalThreads() method where the validation condition did not match the error message.

Problem: The validation used maxLeaseRenewalThreads > 2 but the error message stated "must be greater than or equal to 2". This caused values of exactly 2 to be rejected even though the error message indicated 2 should be valid.

Fix:

• Changed validation from > 2 to >= 2 to match the error message
• Updated Javadoc @throws description from "if maxLeaseRenewalThreads is <= 0" to "if maxLeaseRenewalThreads is less than 2" to accurately describe the actual behavior

Test plan

• Code review - minimal change, logic is straightforward
• Verified the error message already says "must be greater than or equal to 2"
• Unit tests (no existing tests found for this specific validation)

Changes

// Before
Validate.isTrue(maxLeaseRenewalThreads > 2, "The maximum number of lease renewal threads must be greater than or equal to 2.");

// After  
Validate.isTrue(maxLeaseRenewalThreads >= 2, "The maximum number of lease renewal threads must be greater than or equal to 2.");

Fixes #207

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[abhu85]

Friendly ping for review. This is a minimal 2-line fix for the off-by-one validation bug in #207 - the condition > 2 didn't match the error message "must be greater than or equal to 2".