PR #15027 (5 days ago) shipped TELEGRAM_GROUP_ALLOWED_USERS as a chat-ID
allowlist. #17686 correctly renames that to sender user IDs and moves
chat IDs to TELEGRAM_GROUP_ALLOWED_CHATS. Without a shim, any user on
PR #15027's guidance would silently start rejecting group traffic on
upgrade.
- gateway/run.py: in _is_user_authorized, if TELEGRAM_GROUP_ALLOWED_USERS
contains values starting with '-' (chat-ID-shaped), honor them as chat
IDs and log a one-shot deprecation warning pointing users at the new
TELEGRAM_GROUP_ALLOWED_CHATS var.
- tests/gateway/test_unauthorized_dm_behavior.py: three new tests cover
legacy chat-ID values authorizing the listed chat, not crossing to
other chats, and mixed sender/chat values in the same var.
- website/docs/user-guide/messaging/telegram.md: rewrite the Group
Allowlisting section to document the new user/chat split + migration
note. Remove stale '/thread_id' suffix claim (code never parsed it).
- website/docs/reference/environment-variables.md: document all three
Telegram allowlist env vars.
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