feat(tess): add safe runtime observability (#726)

apps/gateway/src/agent/provider.service.ts

@@ -107,8 +107,7 @@ export class ProviderService implements OnModuleInit, OnModuleDestroy {
    * Interval is configurable via PROVIDER_HEALTH_INTERVAL env (seconds, default 60).
    */
   private startHealthCheckScheduler(): void {
-    const intervalSecs =
-      parseInt(process.env['PROVIDER_HEALTH_INTERVAL'] ?? '', 10) || DEFAULT_HEALTH_INTERVAL_SECS;
+    const intervalSecs = this.effectiveHealthCheckIntervalSecs();
     const intervalMs = intervalSecs * 1000;
 
     // Run an initial check immediately (non-blocking)
@@ -176,6 +175,28 @@ export class ProviderService implements OnModuleInit, OnModuleDestroy {
     });
   }
 
+  /**
+   * Returns the effective provider operational policy without credentials,
+   * endpoints, request content, or provider error details.
+   */
+  getEffectivePolicyStatus(): {
+    healthCheckIntervalSecs: number;
+    configuredProviders: string[];
+    availableModelCount: number;
+  } {
+    return {
+      healthCheckIntervalSecs: this.effectiveHealthCheckIntervalSecs(),
+      configuredProviders: this.adapters.map((adapter) => adapter.name),
+      availableModelCount: this.registry?.getAvailable().length ?? 0,
+    };
+  }
+
+  private effectiveHealthCheckIntervalSecs(): number {
+    return (
+      parseInt(process.env['PROVIDER_HEALTH_INTERVAL'] ?? '', 10) || DEFAULT_HEALTH_INTERVAL_SECS
+    );
+  }
+
   // ---------------------------------------------------------------------------
   // Adapter-pattern API
   // ---------------------------------------------------------------------------