fix: document Telegram asDocument alias (#52461) (thanks @bakhtiersizhaev)

* feat(telegram): add asDocument param to message tool

Adds `asDocument` as a user-facing alias for the existing `forceDocument`
parameter in the message tool. When set to `true`, media files (images,
videos, GIFs) are sent via `sendDocument` instead of `sendPhoto`/
`sendVideo`/`sendAnimation`, preserving the original file quality
without Telegram compression.

This is useful when agents need to deliver high-resolution images or
uncompressed files to users via Telegram.

`asDocument` is intentionally an alias rather than a replacement — the
existing `forceDocument` continues to work unchanged.

Changes:
- src/agents/tools/message-tool.ts: add asDocument to send schema
- src/agents/tools/telegram-actions.ts: OR asDocument into forceDocument
- src/infra/outbound/message-action-runner.ts: same OR logic for outbound path
- extensions/telegram/src/channel-actions.ts: read and forward asDocument
- src/channels/plugins/actions/actions.test.ts: add test case

* fix: restore channel-actions.ts to main version (rebase conflict fix)

* fix(test): match asDocument test payload to actual params structure

* fix(telegram): preserve forceDocument alias semantics

* fix: document Telegram asDocument alias (#52461) (thanks @bakhtiersizhaev)

---------

Co-authored-by: Бахтиер Сижаев <bkh@MacBook-Air.local>
Co-authored-by: Ayaan Zaidi <hi@obviy.us>

extensions/telegram/src/action-runtime.ts

@@ -354,7 +354,10 @@ export async function handleTelegramAction(
       quoteText: quoteText ?? undefined,
       asVoice: readBooleanParam(params, "asVoice"),
       silent: readBooleanParam(params, "silent"),
-      forceDocument: readBooleanParam(params, "forceDocument") ?? false,
+      forceDocument:
+        readBooleanParam(params, "forceDocument") ??
+        readBooleanParam(params, "asDocument") ??
+        false,
     });
     return jsonResult({
       ok: true,