TELEGRAM_HOME_CHANNEL set to an @username (not a numeric chat ID) crashed
all webhook/cron->Telegram home-channel delivery with 'ValueError: invalid
literal for int()'. The Telegram Bot API accepts both a numeric chat_id and
an @username string; Hermes was force-coercing every chat_id with int().
Add normalize_telegram_chat_id() (returns int for numeric values, passes
@username strings through) and apply it at the Bot API send/edit sites in
the Telegram adapter and the send_message tool. Username targets are now
recognized as explicit targets in _parse_target_ref.
Reapplies the approach from #13274 (season179), whose branch predated the
gateway/platforms/telegram.py -> plugins/platforms/telegram/adapter.py
relocation. Dupes: #13535 (Tranquil-Flow), #37572 (chewkaah).
Co-authored-by: season179 <season.saw@gmail.com>
