Changelog

[Unreleased]

Transport abstraction removed: ProviderTransport, AppTransport, and AgentTransport interface have been removed. Use the streamFn option directly for custom streaming implementations.
Agent options renamed:
- transport → removed (use streamFn instead)
- messageTransformer → convertToLlm
- preprocessor → transformContext
AppMessage renamed to AgentMessage: All references to AppMessage have been renamed to AgentMessage for consistency.
CustomMessages renamed to CustomAgentMessages: The declaration merging interface has been renamed.
UserMessageWithAttachments and Attachment types removed: Attachment handling is now the responsibility of the convertToLlm function.
Agent loop moved from @mariozechner/pi-ai: The agentLoop, agentLoopContinue, and related types have moved to this package. Import from @mariozechner/pi-agent instead.

streamFn option on Agent for custom stream implementations. Default uses streamSimple from pi-ai.
streamProxy() utility function for browser apps that need to proxy LLM calls through a backend server. Replaces the removed AppTransport.
getApiKey option for dynamic API key resolution (useful for expiring OAuth tokens like GitHub Copilot).
agentLoop() and agentLoopContinue() low-level functions for running the agent loop without the Agent class wrapper.
New exported types: AgentLoopConfig, AgentContext, AgentTool, AgentToolResult, AgentToolUpdateCallback, StreamFn.