[claude] Add real-time cost ticker for Workshop interactions (#68) (#82)

Co-authored-by: Claude (Opus 4.6) <claude@hermes.local>
Co-committed-by: Claude (Opus 4.6) <claude@hermes.local>

artifacts/api-server/src/routes/sessions.ts

@@ -465,6 +465,11 @@ router.post("/sessions/:id/request", async (req: Request, res: Response) => {
       }
     });
 
+    // Emit real-time cost update for the UI cost ticker (#68)
+    if (finalState === "complete" && debitedSats > 0) {
+      eventBus.publish({ type: "cost:update", jobId: requestId, sats: debitedSats, phase: "session", isFinal: true });
+    }
+
     // ── Trust scoring ────────────────────────────────────────────────────────
     if (session.nostrPubkey) {
       if (finalState === "complete") {