v0.3.0 Changelog

Changed

Reframed the boundary guide around the full Agent UI ecosystem: runtime, models, tools, skills/workflows, context, artifacts, evidence, permissions, sessions, and design systems.
Moved the ecosystem boundary guide out of the start section and into reference navigation under /reference/ecosystem-boundaries.
Removed the old Skills/Knowledge-centered boundary page source files.
Updated README, overview, definition, and specification pages so Agent UI is described as a projection layer across the full agent product stack.
Added v0.3.0 version snapshots.