Draft: feat: migrate gRPC middleware to v2, replace go-grpc-prometheus#21

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ankurs wants to merge 7 commits intomainfrom

chore/phase4-middleware-migration

Commits on Mar 25, 2026

feat: migrate gRPC middleware chaining, ctxtags, retry, and prometheus
ankurs
committed
fix: add nil filtering to chain helpers, split server/client prometheus options
ankurs
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fix: auto-register prometheus metrics, match go-grpc-prometheus behavior
ankurs
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fix: wrap stream context for trace propagation, improve docs
ankurs
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fix: rename 'new' parameter to 'replacement' in registerMetrics
ankurs
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fix: client doc lifecycle, interceptor ordering, registration clarity
ankurs
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docs: fix typo 'cleint' -> 'client' in GRPCClientInterceptor
ankurs
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