Add EWMA and load biasing crates for failure-aware P2C balancing#4537

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amr/load-biaser

Commits on May 26, 2026

Commits on May 28, 2026

fix(load-biaser): ensure we deal with gRPC before checking gRPC status
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fix(load-biaser): restrict gRPC failure classification to server errors
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test(load-biaser): add tests for extended gRPC status classification
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test(load-biaser): ensure repeated failures maintain penalty level
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feat(ewma): expose last update timestamp
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test(ewma): verify last_update across construction, changes, and reads
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