Port all 7 features from the Desktop long-polling Telegram channel plugin
to the Gateway webhook-based Telegram bot:
- Markdown → Telegram HTML formatting with parse-error fallback
- Text chunking for messages >4096 chars (paragraph-boundary split)
- Reply-to original message + 👀 ack reaction lifecycle
- Group chat support (mention/reply filtering, @mention stripping)
- Per-chat message serialization (prevents race conditions)
- Inbound media handling (voice/audio/photo/video/document)
with transcription (Whisper) and description (Vision API)
- Outbound file captions with HTML formatting
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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