Q63: model calls are priced and agent and department budgets limit real spend

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/shared/domain.ts

@@ -296,6 +296,10 @@ export interface ProviderRecord {
   workspaceScope: string;
   /** Model context window the run budget is computed against. */
   contextWindowTokens: number;
+  /** Prices in cents per million tokens; null until the operator sets them. */
+  inputCentsPerMtok: number | null;
+  cachedInputCentsPerMtok: number | null;
+  outputCentsPerMtok: number | null;
   createdAt: string;
 }