Implement retry logic for multiple bluesky_reply tool calls
- Collect all bluesky_reply tool calls instead of stopping at first one
- Try each reply candidate until one succeeds or all fail
- Remove fallback to text messages - only use tool calls
- Add detailed logging for debugging which candidate worked/failed
- Improves reliability when Letta API timeouts occur
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Co-Authored-By: Claude <noreply@anthropic.com>