* improve: add exc_info to MoA error logging
* refactor: tighten MoA traceback logging scope
Follow up on salvaged PR #998 by limiting exc_info logging to terminal
failure paths, avoiding duplicate aggregator errors, and refreshing the
MoA default OpenRouter model lineup to current frontier options.
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Co-authored-by: aydnOktay <xaydinoktay@gmail.com>