Chia-Network / chia-blockchain / 28459187561

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[CHIA-4256] Make farmer resilient to malformed pool difficulty responses (#21009)

* Reject malformed pool difficulty values at the HTTP boundary.

Parse GET /pool_info and POST /partial responses through typed pool
protocol schemas, skip invalid per-pool difficulties in new_signage_point,
and add tests for boundary rejection and per-pool fault isolation.

* Record invalid partial stats and reject pool_info error responses.

Keep GET /pool_info error_code handling consistent with prior behavior,
and count malformed POST /partial success bodies as invalid partials.

* Test pool_info error_code rejection at the HTTP boundary.

* Consolidate pool info difficulty regression tests.

Fold the GET /pool_info rejection cases into the existing pool info configuration table so the same boundary behavior is covered without duplicate setup.

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