Enable Protobuf Hybrid API [WiP]#234

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stephanos wants to merge 3 commits intomasterfrom

protobuf-opaque

Commits on Jan 24, 2026

Enable Hybrid API for gradual migration to Opaque API

stephanos
and
claude
committed
Migrate serviceerror and other files to use builder pattern for opaque API

stephanos
and
claude
committed
Update proxygenerator to use opaque API accessors

stephanos
and
claude
committed