agentcore v1.5.0

A ground-up rewrite. old version was a heavy orchestration framework with complex workflows
and rigid abstractions. new version strips it all away — what remains is a minimal, composable
library for building AI agents in Go.

What Changed

old version tried to do everything: workflow orchestration, state machines, chained pipelines.
new version does one thing well: a clean agent loop with streaming events.

Single event stream drives everything — TUI, Web, CLI, whatever you build
Tool interface is 4 methods, not a framework
Context pipeline (transform + convert) replaces rigid middleware chains
Multi-agent via tool invocation, not a separate orchestration layer

Core

Agent — stateful wrapper with subscribe/prompt/abort lifecycle
AgentLoop — double-loop architecture (inner: tool calls + steering, outer: follow-ups)
Event — 11 event types covering the full agent lifecycle
Tool interface — Name, Description, Schema, Execute. That's it.
SubAgent — parallel and chained multi-agent execution as a tool
StreamFn — bring your own LLM, or use the built-in adapters