Adds mention_only config option to Telegram channel, allowing the bot
to only respond to messages that @-mention the bot in group chats.
Direct messages are always processed regardless of this setting.
Behavior:
- When mention_only = true: Bot only responds to group messages containing @botname
- When mention_only = false (default): Bot responds to all allowed messages
- DM/private chats always work regardless of mention_only setting
Implementation:
- Fetch and cache bot username from Telegram API on startup
- Check for @botname mention in group messages
- Strip mention from message content before processing
Config example:
[channels.telegram]
bot_token = "your_token"
mention_only = true
Changes:
- src/config/schema.rs: Add mention_only to TelegramConfig
- src/channels/telegram.rs: Implement mention_only logic + 6 new tests
- src/channels/mod.rs: Update factory calls
- src/cron/scheduler.rs: Update constructor call
- src/onboard/wizard.rs: Update wizard config
- src/daemon/mod.rs: Update test config
- src/integrations/registry.rs: Update test config
- TESTING_TELEGRAM.md: Add mention_only test section
- CHANGELOG.md: Document feature
Risk: medium
Backward compatible: Yes (default: false)
High-priority fixes:
- Message length validation and splitting (4096 char limit)
- Empty chat_id validation to prevent silent failures
- Health check timeout (5s) to prevent service hangs
Testing infrastructure:
- Comprehensive test suite (20+ automated tests)
- Quick smoke test script
- Test message generator
- Complete testing documentation
All changes are backward compatible.
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
