fix: NATS pipeline bugs, add integration tests and service runners

Fix three critical bugs preventing the NATS message pipeline from working:

- FlowProcessor now subscribes to config-push topic (was missing entirely),
  using DeliverPolicy.All to replay config on service restart
- NATS streams use wildcard subjects (tg.flow.>) instead of per-topic
  narrow filters that caused 503 errors on publish
- Subscriber dispatch loop has exponential backoff on errors to prevent
  tight error loops

Add service runner scripts (gateway, config, LLM) and a 7-test
integration suite that verifies config CRUD, WebSocket round-trip,
and full LLM text-completion through the NATS pipeline.

Fix Docker Compose infra: pin Tempo to v2.6.1, remove deprecated Loki
config fields, add user:0 for volume permissions, remap conflicting
ports (FalkorDB 6380, OTLP 4327/4328).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ts/packages/base/src/messaging/subscriber.ts

@@ -111,11 +111,14 @@ export class Subscriber<T> {
   }
 
   private async dispatchLoop(): Promise<void> {
+    let consecutiveErrors = 0;
     while (this.running) {
       try {
         const msg = await this.backend!.receive(2000);
         if (!msg) continue;
 
+        consecutiveErrors = 0;
+
         const props = msg.properties();
         const id = props.id;
         const value = msg.value();
@@ -136,7 +139,15 @@ export class Subscriber<T> {
         await this.backend!.acknowledge(msg);
       } catch (err) {
         if (!this.running) break;
-        console.error("[Subscriber] Error:", err);
+        consecutiveErrors++;
+        if (consecutiveErrors <= 3) {
+          console.error("[Subscriber] Error:", err);
+        } else if (consecutiveErrors === 4) {
+          console.error("[Subscriber] Suppressing further errors (will retry with backoff)");
+        }
+        // Exponential backoff: 1s, 2s, 4s, max 10s
+        const delay = Math.min(1000 * Math.pow(2, consecutiveErrors - 1), 10_000);
+        await new Promise((r) => setTimeout(r, delay));
       }
     }
   }