Use syncSuccessful variable for logging sync outcomes

[Copilot]

Description

The syncSuccessful variable in SyncOrchestrator.cs was assigned in multiple code paths but never read, triggering a dead code warning. This variable tracks sync completion state across three critical paths: normal sync, snapshot recovery, and emergency database recovery.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Changes Made

Added sync outcome logging in finally block:

• Uses syncSuccessful to log successful sync completion at Information level
• Provides consolidated visibility into sync operations without duplicating error logging (failures already logged in catch blocks)
• Variable correctly tracks success across all three sync paths: normal sync (line 314), snapshot sync recovery (line 326), and emergency corruption recovery (line 350)

finally
{
    if (shouldRemoveClient && client != null)
    {
        if (_clients.TryRemove(peer.NodeId, out var removedClient))
        {
            try { removedClient.Dispose(); } catch { /* Ignore disposal errors */ }
        }
    }

    // Log successful sync outcome (failures are already logged in catch blocks)
    if (syncSuccessful)
    {
        _logger.LogInformation("Sync with {NodeId} completed successfully.", peer.NodeId);
    }
}

How Has This Been Tested?

• All sync-related unit tests pass (VectorClockSyncTests)
• Build succeeds with no new warnings
• CodeQL security scan passes with no alerts

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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