fix(logging): suppress fedify inbox HTTP Signature verification noise

lib/federation-setup.js

@@ -99,6 +99,15 @@ export function setupFederation(options) {
           sinks: ["console"],
           lowestLevel: "fatal",
         },
+        {
+          // Noise guard: HTTP Signature verification failures are expected for
+          // incoming activities from servers with expired/gone keys (e.g. deleted
+          // actors, migrated servers). These produce high log volume with no
+          // actionable signal — suppress everything below fatal.
+          category: ["fedify", "federation", "inbox"],
+          sinks: ["console"],
+          lowestLevel: "fatal",
+        },
         {
           // All remaining Fedify logs - federation, vocab, delivery, signatures.
           category: ["fedify"],