Add app diagnostic report (#1728)

* feat(diagnostics): add app diagnostic report

* fix(diagnostics): guard app diagnostic runs

* fix(diagnostics): include websocket runtime metrics

* fix(diagnostics): type websocket metric snapshot

* fix(diagnostics): include daemon shell env

* fix(loop): make stop cancellation test deterministic

packages/client/src/daemon-client.ts

@@ -67,6 +67,7 @@ import type {
   ProviderUsageListResponseMessage,
   DaemonGetStatusResponse,
   DaemonGetPairingOfferResponse,
+  DiagnosticsResponse,
   AgentRewindResponseMessage,
   ListTerminalsResponse,
   CreateTerminalResponse,
@@ -351,6 +352,7 @@ type ProviderDiagnosticPayload = ProviderDiagnosticResponseMessage["payload"];
 type ProviderUsageListPayload = ProviderUsageListResponseMessage["payload"];
 type DaemonStatusPayload = DaemonGetStatusResponse["payload"];
 type DaemonPairingOfferPayload = DaemonGetPairingOfferResponse["payload"];
+type DiagnosticsPayload = DiagnosticsResponse["payload"];
 type ReadProjectConfigPayload = Extract<
   SessionOutboundMessage,
   { type: "read_project_config_response" }
@@ -3755,6 +3757,16 @@ export class DaemonClient {
     });
   }
 
+  async collectDiagnostics(requestId?: string): Promise<DiagnosticsPayload> {
+    return this.sendNamespacedCorrelatedSessionRequest({
+      requestId,
+      message: {
+        type: "diagnostics.request",
+      },
+      timeout: 30000,
+    });
+  }
+
   async patchDaemonConfig(
     config: MutableDaemonConfigPatch,
     requestId?: string,