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b8df0dbd7f
* feat: aggregator
* fix: resolve deadlock, mutation, and safety issues in message aggregator
- Fix deadlock: don't await cancelled timer tasks inside the lock;
_flush_buffer acquires the same lock, causing a deadlock cycle
- Fix message_event mutation: keep original message_event unmodified
to preserve message_id/metadata for reply/quote; only pass merged
message_chain separately
- Fix Plain positional arg: Plain('\n') → Plain(text='\n')
- Fix float() ValueError: wrap delay cast in try/except
- Add MAX_BUFFER_MESSAGES (10) cap to prevent unbounded buffer growth
- Default enabled to false to avoid surprising latency on upgrade
- Fix flush_all: cancel all timers under one lock acquisition, then
flush outside the lock to avoid deadlock
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Co-authored-by: RockChinQ <rockchinq@gmail.com>