fix(engine): handle semaphore and init failures gracefully in async_utils#48

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echobt wants to merge 3 commits intomainfrom

fix/async-utils-panic

Commits on Feb 4, 2026

fix(agents): validate UTF-8 boundaries in mention parsing
echobt
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fix(tui): prevent usize to u16 overflow in card count displays
echobt
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fix(engine): handle semaphore and init failures gracefully in async_utils
echobt
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