Jev 0.3.0

What's new

• Add Test-Jev, a pipeline-friendly yes/no command that returns a Boolean at a configurable probability threshold. Each input makes a live Jev request.
• Add teaching-focused PowerShell demos ported from ThinkThen, including a categorized index and sample inputs.

Documentation

• Document Test-Jev behavior, thresholds, and per-input requests.