fix(activitypub): inbound replies/notifications broken — publicationUrl missing in inbox handlers

collections._publicationUrl was never set, so every pubUrl guard in
handleCreate/handleAnnounce evaluated to undefined:
  - Reply notifications were never created (if pubUrl && ...) always false
  - Boost notifications for our content never created
  - Replies from non-followed accounts never stored in ap_timeline

Fix A: set collections._publicationUrl = publicationUrl before
registerInboxListeners() in federation-setup.js.

Fix B: in handleCreate, add an else-if branch that stores replies to
our own posts in ap_timeline even when the sender is not in ap_following,
so they appear in Mastodon client conversation/notification views.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/patch-ap-inbox-publication-url.mjs

@@ -0,0 +1,115 @@
+/**
+ * Patch: fix inbound reply/like/boost handling — publicationUrl missing in inbox handlers.
+ *
+ * Root cause:
+ *   setupFederation() passes `publicationUrl` to its own scope but does NOT
+ *   pass it to registerInboxListeners(). All inbox handlers (handleCreate,
+ *   handleLike, handleAnnounce) read `collections._publicationUrl` to gate
+ *   notifications and timeline storage, but that property is never set on the
+ *   collections object.
+ *
+ *   Consequence:
+ *     - handleCreate: `if (pubUrl && inReplyTo.startsWith(pubUrl))` is always
+ *       false → reply notifications are never created.
+ *     - handleAnnounce: boost notifications for our content never created.
+ *     - handleCreate: replies to our posts from non-followed accounts are never
+ *       stored in ap_timeline → invisible in Mastodon client conversation views.
+ *
+ * Fix A (federation-setup.js):
+ *   Set `collections._publicationUrl = publicationUrl` immediately before
+ *   registerInboxListeners() so the value flows through to all handlers.
+ *
+ * Fix B (inbox-handlers.js):
+ *   In handleCreate, add an else-if branch that stores replies to our own posts
+ *   in ap_timeline even when the replier is not in ap_following. This runs only
+ *   when pubUrl is correctly set (Fix A).
+ */
+
+import { access, readFile, writeFile } from "node:fs/promises";
+
+const MARKER = "// [patch] ap-inbox-publication-url";
+
+// ── Fix A: federation-setup.js ────────────────────────────────────────────────
+
+const federationCandidates = [
+  "node_modules/@rmdes/indiekit-endpoint-activitypub/lib/federation-setup.js",
+  "node_modules/@indiekit/indiekit/node_modules/@rmdes/indiekit-endpoint-activitypub/lib/federation-setup.js",
+];
+
+const OLD_REGISTER = `  registerInboxListeners(inboxChain, {
+    collections,
+    handle,
+    storeRawActivities,
+  });`;
+
+const NEW_REGISTER = `  // Expose publicationUrl on collections so inbox handlers can gate ${MARKER}
+  // notifications/timeline-storage to our own content only.
+  collections._publicationUrl = publicationUrl;
+  registerInboxListeners(inboxChain, {
+    collections,
+    handle,
+    storeRawActivities,
+  });`;
+
+// ── Fix B: inbox-handlers.js ──────────────────────────────────────────────────
+
+const handlersCandidates = [
+  "node_modules/@rmdes/indiekit-endpoint-activitypub/lib/inbox-handlers.js",
+  "node_modules/@indiekit/indiekit/node_modules/@rmdes/indiekit-endpoint-activitypub/lib/inbox-handlers.js",
+];
+
+const OLD_FOLLOWED_TAGS = `  } else if (collections.ap_followed_tags) {
+    // Not a followed account — check if the post's hashtags match any followed tags`;
+
+const NEW_FOLLOWED_TAGS = `  } else if (pubUrl && inReplyTo && inReplyTo.startsWith(pubUrl)) {
+    // Reply to our post from a non-followed account — store in timeline ${MARKER}
+    // so it appears in the Mastodon client API's conversation/notification view.
+    try {
+      const timelineItem = await extractObjectData(object, {
+        actorFallback: actorObj,
+        documentLoader: authLoader,
+      });
+      timelineItem.visibility = computeVisibility(object);
+      await addTimelineItem(collections, timelineItem);
+    } catch (error) {
+      console.error("[inbox-handlers] Failed to store reply timeline item:", error.message);
+    }
+  } else if (collections.ap_followed_tags) {
+    // Not a followed account — check if the post's hashtags match any followed tags`;
+
+async function exists(p) {
+  try { await access(p); return true; } catch { return false; }
+}
+
+async function patch(candidates, oldSnippet, newSnippet, label) {
+  let checked = 0; let patched = 0;
+  for (const filePath of candidates) {
+    if (!(await exists(filePath))) continue;
+    checked++;
+    const source = await readFile(filePath, "utf8");
+    if (source.includes(MARKER)) {
+      console.log(`[postinstall] patch-ap-inbox-publication-url: ${label} already applied to ${filePath}`);
+      continue;
+    }
+    if (!source.includes(oldSnippet)) {
+      console.warn(`[postinstall] patch-ap-inbox-publication-url: ${label} snippet not found in ${filePath}`);
+      continue;
+    }
+    await writeFile(filePath, source.replace(oldSnippet, newSnippet), "utf8");
+    patched++;
+    console.log(`[postinstall] Applied patch-ap-inbox-publication-url (${label}) to ${filePath}`);
+  }
+  return { checked, patched };
+}
+
+const a = await patch(federationCandidates, OLD_REGISTER, NEW_REGISTER, "set _publicationUrl");
+const b = await patch(handlersCandidates, OLD_FOLLOWED_TAGS, NEW_FOLLOWED_TAGS, "store reply from non-follower");
+
+const total = a.patched + b.patched;
+if (a.checked + b.checked === 0) {
+  console.log("[postinstall] patch-ap-inbox-publication-url: no target files found");
+} else if (total === 0) {
+  console.log("[postinstall] patch-ap-inbox-publication-url: already up to date");
+} else {
+  console.log(`[postinstall] patch-ap-inbox-publication-url: patched ${total} file(s)`);
+}