* feat(telegram): auto-rename DM topics on first message
fix(telegram): use bot.api for topic rename to avoid SecretRef resolution
* fix(telegram): address security + test review feedback
- Fix test assertion: DEFAULT_PROMPT_SUBSTRING matches 'very short'
- Use RawBody instead of Body (no envelope metadata to LLM)
- Truncate user message to 500 chars for LLM prompt
- Remove user-derived content from verbose logs
- Remove redundant threadSpec.id null check
- Fix AutoTopicLabelParams type to match generateTopicLabel
* fix(telegram): use effective dm auto-topic config
* fix(telegram): detect direct auto-topic overrides
* fix: auto-rename Telegram DM topics on first message (#51502) (thanks @Lukavyi)
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Co-authored-by: Ayaan Zaidi <hi@obviy.us>
