feat: add usage cost reporting

src/auto-reply/reply/session.ts

@@ -194,6 +194,7 @@ export async function initSessionState(params: {
     // Persist previously stored thinking/verbose levels when present.
     thinkingLevel: persistedThinking ?? baseEntry?.thinkingLevel,
     verboseLevel: persistedVerbose ?? baseEntry?.verboseLevel,
+    responseUsage: baseEntry?.responseUsage,
     modelOverride: persistedModelOverride ?? baseEntry?.modelOverride,
     providerOverride: persistedProviderOverride ?? baseEntry?.providerOverride,
     sendPolicy: baseEntry?.sendPolicy,