Tighten telemetry review fixes

The fixture package now declares the OpenTelemetry API dependency that
its public test metric helpers expose in their exported types. The
federation metric instruments also use the package metadata directly,
matching the surrounding tracing code.

#755 (review)
#755 (comment)

Assisted-by: gpt-5.5

Author: dahlia

packages/fedify/src/federation/metrics.ts

@@ -7,9 +7,6 @@ import {
 } from "@opentelemetry/api";
 import metadata from "../../deno.json" with { type: "json" };
 
-const meterName = metadata.name || "@fedify/fedify";
-const meterVersion = metadata.version || undefined;
-
 class FederationMetrics {
   readonly deliverySent: Counter;
   readonly deliveryPermanentFailure: Counter;
@@ -18,7 +15,7 @@ class FederationMetrics {
   readonly inboxProcessingDuration: Histogram;
 
   constructor(meterProvider: MeterProvider) {
-    const meter = meterProvider.getMeter(meterName, meterVersion);
+    const meter = meterProvider.getMeter(metadata.name, metadata.version);
     this.deliverySent = meter.createCounter("activitypub.delivery.sent", {
       description: "ActivityPub delivery attempts.",
       unit: "{attempt}",

packages/fixture/package.json

@@ -34,6 +34,7 @@
   "dependencies": {
     "@fedify/vocab-runtime": "workspace:^",
     "@logtape/logtape": "catalog:",
+    "@opentelemetry/api": "catalog:",
     "@opentelemetry/core": "catalog:",
     "@opentelemetry/sdk-trace-base": "catalog:"
   },