feat(telegram): add sticker support with vision caching

Add support for receiving and sending Telegram stickers:

Inbound:
- Receive static WEBP stickers (skip animated/video)
- Process stickers through dedicated vision call for descriptions
- Cache vision descriptions to avoid repeated API calls
- Graceful error handling for fetch failures

Outbound:
- Add sticker action to send stickers by fileId
- Add sticker-search action to find cached stickers by query
- Accept stickerId from shared schema, convert to fileId

Cache:
- Store sticker metadata (fileId, emoji, setName, description)
- Fuzzy search by description, emoji, and set name
- Persist to ~/.clawdbot/telegram/sticker-cache.json

Config:
- Single `channels.telegram.actions.sticker` option enables both
  send and search actions

🤖 AI-assisted: Built with Claude Code (claude-opus-4-5)
Testing: Fully tested - unit tests pass, live tested on dev gateway
The contributor understands and has reviewed all code changes.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/channels/plugins/actions/telegram.ts

@@ -1,6 +1,7 @@
 import {
   createActionGate,
   readNumberParam,
+  readStringArrayParam,
   readStringOrNumberParam,
   readStringParam,
 } from "../../../agents/tools/common.js";
@@ -45,6 +46,10 @@ export const telegramMessageActions: ChannelMessageActionAdapter = {
     if (gate("reactions")) actions.add("react");
     if (gate("deleteMessage")) actions.add("delete");
     if (gate("editMessage")) actions.add("edit");
+    if (gate("sticker")) {
+      actions.add("sticker");
+      actions.add("sticker-search");
+    }
     return Array.from(actions);
   },
   supportsButtons: ({ cfg }) => {
@@ -141,6 +146,41 @@ export const telegramMessageActions: ChannelMessageActionAdapter = {
       );
     }
 
+    if (action === "sticker") {
+      const to =
+        readStringParam(params, "to") ?? readStringParam(params, "target", { required: true });
+      // Accept stickerId (array from shared schema) and use first element as fileId
+      const stickerIds = readStringArrayParam(params, "stickerId");
+      const fileId = stickerIds?.[0] ?? readStringParam(params, "fileId", { required: true });
+      const replyToMessageId = readNumberParam(params, "replyTo", { integer: true });
+      const messageThreadId = readNumberParam(params, "threadId", { integer: true });
+      return await handleTelegramAction(
+        {
+          action: "sendSticker",
+          to,
+          fileId,
+          replyToMessageId: replyToMessageId ?? undefined,
+          messageThreadId: messageThreadId ?? undefined,
+          accountId: accountId ?? undefined,
+        },
+        cfg,
+      );
+    }
+
+    if (action === "sticker-search") {
+      const query = readStringParam(params, "query", { required: true });
+      const limit = readNumberParam(params, "limit", { integer: true });
+      return await handleTelegramAction(
+        {
+          action: "searchSticker",
+          query,
+          limit: limit ?? undefined,
+          accountId: accountId ?? undefined,
+        },
+        cfg,
+      );
+    }
+
     throw new Error(`Action ${action} is not supported for provider ${providerId}.`);
   },
 };

src/channels/plugins/message-action-names.ts

@@ -25,6 +25,7 @@ export const CHANNEL_MESSAGE_ACTION_NAMES = [
   "thread-reply",
   "search",
   "sticker",
+  "sticker-search",
   "member-info",
   "role-info",
   "emoji-list",