fix(regression): guard malformed telegram reaction payloads

extensions/telegram/src/status-reaction-variants.ts

@@ -170,6 +170,9 @@ export function extractTelegramAllowedEmojiReactions(
     // Explicitly omitted/null => all emoji reactions are allowed in this chat.
     return null;
   }
+  if (!Array.isArray(availableReactions)) {
+    return new Set<string>();
+  }
 
   const allowed = new Set<string>();
   for (const reaction of availableReactions) {

extensions/telegram/src/status.test.ts

@@ -157,6 +157,14 @@ describe("extractTelegramAllowedEmojiReactions", () => {
     });
     expect(result ? Array.from(result).toSorted() : null).toEqual(["👍", "🔥"]);
   });
+
+  it("treats malformed available_reactions payloads as an empty allowlist instead of throwing", () => {
+    expect(
+      extractTelegramAllowedEmojiReactions({
+        available_reactions: { type: "emoji", emoji: "👍" },
+      } as never),
+    ).toEqual(new Set<string>());
+  });
 });
 
 describe("resolveTelegramAllowedEmojiReactions", () => {