PenEcho v0.1.0

First public release of PenEcho.

• Think with AI through handwriting, equations, diagrams, and spatial context on a shared canvas.
• Run with an OpenAI-compatible or Anthropic API.
• Run directly through an authenticated Codex CLI without an API key.
• Keep AI responses editable until you accept them.
• Licensed under AGPL-3.0-only, with commercial licensing available separately.