컨텍스트 카드 모델별 사용량 가시화 보강

- AX Agent 하단 컨텍스트 카드에 현재 서비스·모델 기준 오늘 사용량을 함께 표시하고 hover에서 현재 모델 usage·compact 이후 usage·오늘 상위 모델 usage를 확인할 수 있게 함

- UsageStatisticsService에 오늘 통계 스냅샷 API를 추가하고 long-safe 토큰 포맷 경로를 넣어 per-model 집계가 커져도 K/M 단위로 안정적으로 표시되게 함

- README.md와 docs/DEVELOPMENT.md에 2026-04-05 00:34 (KST) 기준 이력을 반영함

- 검증: dotnet build src/AxCopilot/AxCopilot.csproj -c Release -v minimal -p:OutputPath=bin\\verify\\ -p:IntermediateOutputPath=obj\\verify\\ / 경고 0 / 오류 0

src/AxCopilot/Services/UsageStatisticsService.cs

@@ -141,6 +141,16 @@ internal static class UsageStatisticsService
         return result;
     }
 
+    /// <summary>오늘자 통계 스냅샷을 반환합니다.</summary>
+    public static DailyUsageStats GetTodaySnapshot()
+    {
+        EnsureInitialized();
+        lock (_lock)
+        {
+            return CloneToday();
+        }
+    }
+
     // ─── 내부 ────────────────────────────────────────────────────────────────
 
     private static void EnsureInitialized()

src/AxCopilot/Views/ChatWindow.xaml.cs

@@ -16680,9 +16680,22 @@ private static (string icon, string label, string bgHex, string fgHex) GetDecisi
         TokenUsageArc.Stroke = progressBrush;
         TokenUsageThresholdMarker.Fill = progressBrush;
         var percentText = $"{Math.Round(usageRatio * 100):0}%";
+        var (currentService, currentModel) = _llm.GetCurrentModelInfo();
+        var todayUsage = Services.UsageStatisticsService.GetTodaySnapshot();
+        var currentModelUsageKey = BuildUsageModelKey(currentService, currentModel);
+        var currentModelPromptTokens = GetUsageValue(todayUsage.ModelPromptTokens, currentModelUsageKey);
+        var currentModelCompletionTokens = GetUsageValue(todayUsage.ModelCompletionTokens, currentModelUsageKey);
+        var currentModelTotalTokens = currentModelPromptTokens + currentModelCompletionTokens;
+        var currentModelPostPromptTokens = GetUsageValue(todayUsage.PostCompactionPromptTokens, currentModelUsageKey);
+        var currentModelPostCompletionTokens = GetUsageValue(todayUsage.PostCompactionCompletionTokens, currentModelUsageKey);
+        var currentModelPostTotalTokens = currentModelPostPromptTokens + currentModelPostCompletionTokens;
         TokenUsagePercentText.Text = percentText;
         TokenUsageSummaryText.Text = $"컨텍스트 {percentText}";
-        TokenUsageHintText.Text = $"{Services.TokenEstimator.Format(currentTokens)} / {Services.TokenEstimator.Format(maxContextTokens)}";
+        TokenUsageHintText.Text =
+            $"{Services.TokenEstimator.Format(currentTokens)} / {Services.TokenEstimator.Format(maxContextTokens)}" +
+            (currentModelTotalTokens > 0
+                ? $" · 오늘 {FormatTokenCount(currentModelTotalTokens)}"
+                : "");
         CompactNowLabel.Text = compactLabel;
         var compactHistory = _lastCompactionAt.HasValue && _lastCompactionBeforeTokens.HasValue && _lastCompactionAfterTokens.HasValue
             ? $"\n최근 압축: {(_lastCompactionWasAutomatic ? "자동" : "수동")} · {_lastCompactionAt.Value:HH:mm:ss}\n" +
@@ -16702,6 +16715,14 @@ private static (string icon, string label, string bgHex, string fgHex) GetDecisi
               $"compact 이후 사용량: {Services.TokenEstimator.Format(_sessionPostCompactionPromptTokens)} + {Services.TokenEstimator.Format(_sessionPostCompactionCompletionTokens)} = {Services.TokenEstimator.Format(_sessionPostCompactionPromptTokens + _sessionPostCompactionCompletionTokens)} tokens"
             : "";
         var pendingPostCompaction = _pendingPostCompaction ? "\ncompact 후 첫 응답 대기 중" : "";
+        var currentModelUsageText = !string.IsNullOrWhiteSpace(currentModelUsageKey)
+            ? $"\n현재 모델: {currentService} · {currentModel}\n" +
+              $"오늘 모델 사용량: {FormatTokenCount(currentModelPromptTokens)} + {FormatTokenCount(currentModelCompletionTokens)} = {FormatTokenCount(currentModelTotalTokens)} tokens" +
+              (currentModelPostTotalTokens > 0
+                  ? $"\n현재 모델 compact 이후: {FormatTokenCount(currentModelPostPromptTokens)} + {FormatTokenCount(currentModelPostCompletionTokens)} = {FormatTokenCount(currentModelPostTotalTokens)} tokens"
+                  : "")
+            : "";
+        var topModelsText = BuildTopModelUsageSummary(todayUsage);
 
         TokenUsageCard.ToolTip =
             $"상태: {summary}\n" +
@@ -16709,6 +16730,8 @@ private static (string icon, string label, string bgHex, string fgHex) GetDecisi
             $"간단 표기: {Services.TokenEstimator.Format(currentTokens)} / {Services.TokenEstimator.Format(maxContextTokens)}\n" +
             $"자동 압축 시작: {triggerPercent}%\n" +
             $"현재 입력 초안 포함" +
+            currentModelUsageText +
+            topModelsText +
             compactHistory +
             compactSession +
             postCompactionUsage +
@@ -16718,6 +16741,65 @@ private static (string icon, string label, string bgHex, string fgHex) GetDecisi
         PositionThresholdMarker(TokenUsageThresholdMarker, triggerRatio, 18, 18, 14, 3);
     }
 
+    private static string BuildUsageModelKey(string? service, string? model)
+    {
+        var normalizedService = (service ?? "").Trim().ToLowerInvariant();
+        var normalizedModel = (model ?? "").Trim();
+        if (string.IsNullOrWhiteSpace(normalizedService) || string.IsNullOrWhiteSpace(normalizedModel))
+            return "";
+        return $"{normalizedService}:{normalizedModel}";
+    }
+
+    private static long GetUsageValue(Dictionary<string, long>? source, string key)
+    {
+        if (source == null || string.IsNullOrWhiteSpace(key))
+            return 0;
+        return source.TryGetValue(key, out var value) ? value : 0;
+    }
+
+    private string BuildTopModelUsageSummary(DailyUsageStats todayUsage)
+    {
+        if (todayUsage.ModelPromptTokens.Count == 0 && todayUsage.ModelCompletionTokens.Count == 0)
+            return "";
+
+        var totals = new Dictionary<string, long>(StringComparer.OrdinalIgnoreCase);
+        foreach (var pair in todayUsage.ModelPromptTokens)
+            totals[pair.Key] = pair.Value;
+        foreach (var pair in todayUsage.ModelCompletionTokens)
+            totals[pair.Key] = totals.TryGetValue(pair.Key, out var current) ? current + pair.Value : pair.Value;
+
+        var topEntries = totals
+            .OrderByDescending(pair => pair.Value)
+            .Take(3)
+            .Select(pair =>
+            {
+                var label = pair.Key.Replace(":", " · ");
+                var postPrompt = GetUsageValue(todayUsage.PostCompactionPromptTokens, pair.Key);
+                var postCompletion = GetUsageValue(todayUsage.PostCompactionCompletionTokens, pair.Key);
+                var postTotal = postPrompt + postCompletion;
+                return postTotal > 0
+                    ? $"- {label}: {FormatTokenCount(pair.Value)} tokens (compact 이후 {FormatTokenCount(postTotal)})"
+                    : $"- {label}: {FormatTokenCount(pair.Value)} tokens";
+            })
+            .ToList();
+
+        return topEntries.Count == 0
+            ? ""
+            : "\n오늘 상위 모델\n" + string.Join("\n", topEntries);
+    }
+
+    private static string FormatTokenCount(long value)
+    {
+        if (value <= int.MaxValue)
+            return Services.TokenEstimator.Format((int)value);
+
+        if (value >= 1_000_000)
+            return $"{value / 1_000_000d:0.#}M";
+        if (value >= 1_000)
+            return $"{value / 1_000d:0.#}K";
+        return value.ToString("N0");
+    }
+
     private static void UpdateCircularUsageArc(System.Windows.Shapes.Path path, double ratio, double centerX, double centerY, double radius)
     {
         ratio = Math.Clamp(ratio, 0, 0.9999);