fix(server): ensure DefaultRequestHandler cancels producer on blocking failure#645

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Wondr-design:fix/609-hang-on-consumer-failure

Commits on Jan 25, 2026

fix(server): ensure DefaultRequestHandler cancels producer on blocking failure (#609)
Wondr-design
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fix(server): suppress CancelledError in cleanup and fix test expectation
Wondr-design
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fix(ci): resolve linter errors SIM105 and PYI034/ANN204
Wondr-design
committed