feat(logging): deepen coordinator and core logging (NCS-72)
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Coordinator: InstanceRegistry logs instance join/update/dead/remove; CoordinatorGrpcServer logs new stream + first heartbeat per instance; CoreGrpcClient logs channel open/evict and RPC success counts. Core: GameResource replaces println with logger; RedisGameRegistry logs store/Redis-load/DB-load and surfaces silent failures; CoordinatorServiceHandler logs inbound gRPC commands; IoGrpcClientWrapper and RuleSetGrpcAdapter wrap gRPC calls with WARN on failure. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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