Last ned opencode 0.15.4

- Fixed OpenAI provider to use chat language model instead of completion language model
- Added session option to attach command for connecting to specific sessions
- Added Slack integration package with Bolt framework support
- Simplified SDK getting started with single createOpencode function that creates both server and client
- Added createOpencodeTui() function to SDK for programmatic TUI launching
- Filtered out alpha status models from provider list for better model selection
- Made compact feature use streaming API for improved performance
- Updated Bedrock provider for Australian Sonnet 4.5 cross-region inference support
- Added support for custom tools through plugin system
- Allowed read tool to handle image files
- Improved HTTP error codes for better error reporting
- Added timeout to fetch models.dev refresh request for reliability
- Fixed false positive package manager detection in upgrade command
- Disabled workspace symbol lookup to prevent LSP performance issues
- Fixed config directory overrides for better configuration management
- Added useCompletionUrls option to fix certain Azure setups
- Included stack trace in server error responses for debugging
- Fixed typecheck issues across packages
- Fixed rg hanging forever when run in bash waiting for stdin
- Fixed perl6 file extension support
- Improved directory validation error messages
- Fixed clang formatter name configuration