fix: guard getInReplyTo call for partial Fedify objects

Some resolved Note objects from Create activities don't have
getInReplyTo as a function (Fedify stub/partial resolution).
Add typeof check and try-catch to prevent inbox processing crash.

lib/inbox-listeners.js

@@ -207,10 +207,14 @@ export function registerInboxListeners(inboxChain, options) {
         actorObj?.preferredUsername?.toString() ||
         actorUrl;
 
-      const inReplyTo =
-        object instanceof Note
-          ? (await object.getInReplyTo())?.id?.href
-          : null;
+      let inReplyTo = null;
+      if (object instanceof Note && typeof object.getInReplyTo === "function") {
+        try {
+          inReplyTo = (await object.getInReplyTo())?.id?.href ?? null;
+        } catch {
+          /* remote fetch may fail */
+        }
+      }
 
       // Log replies to our posts (existing behavior for conversations)
       if (inReplyTo) {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@rmdes/indiekit-endpoint-activitypub",
-  "version": "1.0.11",
+  "version": "1.0.12",
   "description": "ActivityPub federation endpoint for Indiekit via Fedify. Adds full fediverse support: actor, inbox, outbox, followers, following, syndication, and Mastodon migration.",
   "keywords": [
     "indiekit",