Changes
PR #1986 by ksylvan: Support Anthropic Opus 4.6
- Upgrade anthropic-sdk-go from v1.20.0 to v1.21.0
- Add
ClaudeOpus4_6to supported Anthropic model list - Remove unused indirect dependencies from go.mod and go.sum
- Clean up legacy protobuf and gRPC version references
- Drop unused table writer and console dependencies