Replace redundant XML documentation with inheritdoc

[konard]

Summary

Replaced redundant XML documentation comments with <inheritdoc /> for standard .NET methods that override base class methods or implement interface methods.

Changes Made

• ToString(): Replaced verbose documentation with <inheritdoc /> since it overrides Object.ToString()
• Equals(object obj): Replaced redundant documentation with <inheritdoc /> since it overrides Object.Equals()
• GetHashCode(): Replaced standard documentation with <inheritdoc /> since it overrides Object.GetHashCode()
• Equals(Timestamp other): Replaced documentation with <inheritdoc /> since it implements IEquatable<T>.Equals()

Benefits

• Follows .NET XML documentation best practices
• Reduces code duplication and maintenance overhead
• Ensures documentation stays in sync with base class/interface definitions
• Cleaner, more concise code

Testing

• ✅ Solution builds successfully with no errors
• ✅ All existing tests pass
• ✅ No functional changes to the code behavior

This addresses issue #18 by using <inheritdoc /> for methods that inherit their behavior and documentation from .NET base classes.

🤖 Generated with Claude Code

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Resolves #18