* feat(telegram): expose forum topic names in agent context
Telegram Bot API does not provide a method to look up forum topic names
by thread ID. This adds an in-memory LRU cache that learns topic names
from service messages (forum_topic_created, forum_topic_edited,
forum_topic_closed, forum_topic_reopened) and seeds from
reply_to_message.forum_topic_created as a fallback for pre-existing
topics.
The resolved topic name is surfaced as:
- TopicName in MsgContext (available to {{TopicName}} in templates)
- topic_name in the agent prompt metadata block
- topicName in plugin hook event metadata
Includes unit tests for the topic-name-cache module (11 tests including
eviction and read-recency).
Known limitation: cache is in-memory only; after a restart it falls back
to the creation-time name until a rename event is observed.
* refactor(telegram): distill topic name flow
* fix: expose telegram topic names in agent context (#65973) (thanks @ptahdunbar)
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Co-authored-by: Ayaan Zaidi <hi@obviy.us>
