Four production-readiness additions to topic mode:
1. /topic off — clean disable path. Flips telegram_dm_topic_mode.enabled
to 0 and clears telegram_dm_topic_bindings for this chat. Previously
users had to edit state.db with sqlite3 to turn the feature off.
Idempotent: calling /topic off when the chat was never enabled
returns a friendly no-op message.
2. /topic help — inline usage printed in the DM so users don't have to
visit docs to discover /topic off, /topic <session-id>, etc.
3. Authorization gate. /topic mutates SQLite side tables and flips the
root DM into a lobby, so the action must be authorized. Now calls
self._is_user_authorized(source); unauthorized DMs get a refusal
instead of activation. Defense in depth on top of the gateway's
existing pre-route auth.
4. BotFather screenshot debounce. A user repeatedly running /topic
while Threads Settings is still disabled would previously re-upload
the same screenshot every time. Now rate-limited to one send per
5 minutes per chat. /topic off resets the counter so re-enabling
starts fresh.
Command-def args hint updated: /topic [off|help|session-id].
Docs:
- New /topic subcommands table at the top of the multi-session section
- Disable instructions updated to recommend /topic off first, with the
raw SQL fallback kept for bulk cleanup
- Under-the-hood list extended with the capability-hint debounce and
the authorization gate
Tests (6 new):
- /topic help returns usage and doesn't create topic tables
- /topic off disables mode AND clears bindings
- /topic off is idempotent when never enabled
- Unauthorized users get refusal, no tables created
- Capability-hint debounce is per-chat
- /topic off resets both lobby and capability debounce counters
All 402 targeted tests pass. Full gateway sweep: 4809/4810
(pre-existing test_teams::test_send_typing unrelated).
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