Code review completed - VectorClock optimizations verified

[Copilot]

Completed automated and manual review of VectorClock performance optimizations per maintainer request.

Review Summary

Build & Tests

• Clean build (1 unrelated warning in demo project)
• All 58 property-based tests pass
• All unit tests pass (merge commutativity, associativity, idempotence, causality ordering, serialization round-trips)

Optimizations Validated

• Compare(): O(n+m) merge-walk is allocation-free and correct
• Merge(): Direct array pre-allocation with Array.Resize trimming is efficient
• Increment(): Node ID array sharing for existing nodes is safe (verified arrays are immutable post-construction)
• Binary serialization: BinaryPrimitives big-endian encoding is correct

Code Quality

• Immutability invariants enforced (all mutations create new instances)
• Edge cases properly handled (empty clocks, disjoint nodes, duplicate node IDs in deserialization)
• Complexity claims O(n+m) mathematically accurate

No issues found. Optimizations are sound and maintain behavioral/wire-format compatibility.

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