feat: surface Copilot usage and quota data across the UI

Add three layers of usage visibility:

- ChatPane footer: premium request count, AIU consumed, and quota
  remaining below the existing context-window bar
- Settings / CopilotStatusCard: on-demand account quota section with
  progress bars, overage indicators, and reset dates fetched via
  the new get-quota sidecar command
- Activity Panel: per-agent token/cost/duration totals on each agent
  row and a Session Usage summary section between agents and timeline

Backend (sidecar):
- New get-quota command using SDK account.getQuota RPC
- New assistant-usage turn-scoped event from SDK assistant.usage
- QuotaSnapshotMapper for both typed and untyped SDK quota payloads
- DTOs: GetQuotaCommandDto, QuotaSnapshotDto, AccountQuotaResultEventDto,
  AssistantUsageEventDto

Frontend:
- Shared types: AssistantUsageEvent, QuotaSnapshot, GetQuotaCommand
- IPC bridge: getQuota channel, assistant-usage event dispatch
- State: SessionRequestUsageMap accumulator with per-agent breakdown
- 8 new tests for accumulator logic and formatting helpers

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

sidecar/tests/Aryx.AgentHost.Tests/CopilotTurnExecutionStateTests.cs

@@ -251,6 +251,69 @@ public sealed class CopilotTurnExecutionStateTests
         Assert.Empty(state.DrainPendingEvents());
     }
 
+    [Fact]
+    public void ObserveSessionEvent_AssistantUsage_QueuesAssistantUsageEvent()
+    {
+        RunTurnCommandDto command = CreateCommand();
+        CopilotTurnExecutionState state = new(command);
+
+        state.ObserveSessionEvent(
+            command.Pattern.Agents[0],
+            SessionEvent.FromJson(
+                """
+                {
+                  "type": "assistant.usage",
+                  "data": {
+                    "model": "gpt-5.4",
+                    "inputTokens": 1200,
+                    "outputTokens": 300,
+                    "cacheReadTokens": 50,
+                    "cacheWriteTokens": 10,
+                    "cost": 0.42,
+                    "duration": 8200,
+                    "quotaSnapshots": {
+                      "premium_interactions": {
+                        "entitlementRequests": 50,
+                        "usedRequests": 12,
+                        "remainingPercentage": 76,
+                        "overage": 0,
+                        "overageAllowedWithExhaustedQuota": true,
+                        "resetDate": "2026-04-01T00:00:00Z"
+                      }
+                    },
+                    "copilotUsage": {
+                      "tokenDetails": [
+                        {
+                          "batchSize": 1,
+                          "costPerBatch": 1,
+                          "tokenCount": 1500,
+                          "tokenType": "input"
+                        }
+                      ],
+                      "totalNanoAiu": 1200000000
+                    }
+                  },
+                  "id": "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa",
+                  "timestamp": "2026-03-27T00:00:00Z"
+                }
+                """));
+
+        AssistantUsageEventDto evt = Assert.Single(state.DrainPendingEvents().OfType<AssistantUsageEventDto>());
+        Assert.Equal("session-1", evt.SessionId);
+        Assert.Equal("agent-1", evt.AgentId);
+        Assert.Equal("Primary", evt.AgentName);
+        Assert.Equal("gpt-5.4", evt.Model);
+        Assert.Equal(1200, evt.InputTokens);
+        Assert.Equal(300, evt.OutputTokens);
+        Assert.Equal(0.42, evt.Cost);
+        Assert.Equal(8200, evt.Duration);
+        Assert.Equal(1200000000, evt.TotalNanoAiu);
+        QuotaSnapshotDto snapshot = Assert.Single(evt.QuotaSnapshots!.Values);
+        Assert.Equal(50, snapshot.EntitlementRequests);
+        Assert.Equal(12, snapshot.UsedRequests);
+        Assert.Equal(76, snapshot.RemainingPercentage);
+    }
+
     [Fact]
     public void ObserveSessionEvent_SessionCompactionComplete_QueuesCompactionEvent()
     {

sidecar/tests/Aryx.AgentHost.Tests/SidecarProtocolHostTests.cs

@@ -850,6 +850,44 @@ public sealed class SidecarProtocolHostTests
         Assert.Equal("session-1", sessionManager.DeletedAryxSessionId);
     }
 
+    [Fact]
+    public async Task GetQuotaCommand_ReturnsQuotaResultEvent()
+    {
+        SidecarProtocolHost host = new(
+            new PatternValidator(),
+            sessionManager: new FakeSessionManager
+            {
+                QuotaSnapshots = new Dictionary<string, QuotaSnapshotDto>(StringComparer.Ordinal)
+                {
+                    ["premium_interactions"] = new()
+                    {
+                        EntitlementRequests = 50,
+                        UsedRequests = 12,
+                        RemainingPercentage = 76,
+                        Overage = 0,
+                        OverageAllowedWithExhaustedQuota = true,
+                        ResetDate = "2026-04-01T00:00:00Z",
+                    },
+                },
+            });
+
+        IReadOnlyList<JsonElement> events = await RunHostAsync(
+            new GetQuotaCommandDto
+            {
+                Type = "get-quota",
+                RequestId = "quota-1",
+            },
+            host);
+
+        JsonElement quotaEvent = AssertSingleEvent(events, "quota-result", "quota-1");
+        JsonElement snapshot = quotaEvent.GetProperty("quotaSnapshots").GetProperty("premium_interactions");
+        Assert.Equal(50, snapshot.GetProperty("entitlementRequests").GetDouble());
+        Assert.Equal(12, snapshot.GetProperty("usedRequests").GetDouble());
+        Assert.Equal(76, snapshot.GetProperty("remainingPercentage").GetDouble());
+        Assert.True(snapshot.GetProperty("overageAllowedWithExhaustedQuota").GetBoolean());
+        Assert.Equal("2026-04-01T00:00:00Z", snapshot.GetProperty("resetDate").GetString());
+    }
+
     [Fact]
     public async Task DisconnectSessionCommand_CancelsActiveTurnsForSession()
     {
@@ -1115,6 +1153,9 @@ public sealed class SidecarProtocolHostTests
 
         public IReadOnlyList<CopilotSessionInfoDto> DeletedSessions { get; init; } = [];
 
+        public IReadOnlyDictionary<string, QuotaSnapshotDto> QuotaSnapshots { get; init; }
+            = new Dictionary<string, QuotaSnapshotDto>(StringComparer.Ordinal);
+
         public string? DeletedAryxSessionId { get; private set; }
 
         public string? DeletedCopilotSessionId { get; private set; }
@@ -1135,5 +1176,11 @@ public sealed class SidecarProtocolHostTests
             DeletedCopilotSessionId = copilotSessionId;
             return Task.FromResult(DeletedSessions);
         }
+
+        public Task<IReadOnlyDictionary<string, QuotaSnapshotDto>> GetQuotaAsync(
+            CancellationToken cancellationToken)
+        {
+            return Task.FromResult(QuotaSnapshots);
+        }
     }
 }