The send_message tool's _send_telegram() sent MEDIA:<path> tags as
literal text instead of delivering actual files. This fixes it by
extracting MEDIA tags via BasePlatformAdapter.extract_media() and
routing files to the appropriate Telegram Bot API method by extension.
Changes:
- send_message_tool: extract MEDIA tags and send files natively as
photo/video/voice/audio/document based on file extension
- send_message_tool: add per-file error handling and missing-file logging
- send_message_tool: use cleaned text in fallback to avoid leaking tags
- base.py extract_media: handle optional space after MEDIA: colon
- base.py extract_media: strip surrounding backticks/quotes from paths
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>