Revert StreamJsonRpc to 2.22.23 (matches transitive dependency version)

[Copilot]

Dependabot upgraded StreamJsonRpc from 2.22.23 to 2.24.84, but this creates a version conflict with GitHub.Copilot.SDK's transitive dependency.

Changes

• Downgrade StreamJsonRpc: 2.24.84 → 2.22.23 to align with GitHub.Copilot.SDK's transitive dependency
• Update README.md: Correct dependency table to reflect actual package versions

Rationale

StreamJsonRpc 2.22.23 is already pulled in transitively by GitHub.Copilot.SDK. The explicit reference is required because C# doesn't expose transitive dependencies for direct code usage (StreamJsonRpc.RemoteInvocationException in App.cs). Using the transitive version avoids potential runtime conflicts.

// App.cs requires explicit access to StreamJsonRpc namespace
catch (StreamJsonRpc.RemoteInvocationException ex)
{
    _logger.LogError("JSON-RPC Error: {Message}", ex.Message);
    return 1;
}

This follows the error handling pattern documented in GitHub.Copilot.SDK's official README.

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