v0.3.1 — README rework, project page, structured data

Documentation and discoverability release. No changes to capture, metrics or the data contract.

Added

• A comparison section in the README explaining what open-geo, a hosted monitoring service and a DIY API/scraping script are each built for, plus an "At a glance" fact table.
• An expanded FAQ: what GEO is, which engines are supported, whether capture uses the API or the real UI, audit versus continuous monitoring, and URL-prefix targets.
• A project page under docs/ (GitHub Pages) carrying SoftwareApplication and FAQPage structured data, plus llms.txt and a robots.txt that explicitly admits AI search crawlers.
• This changelog.

Changed

• The README opens with a direct definition of what open-geo is and how it measures, in all four languages (English, Русский, 中文, العربية).

Fixed

• The plugin manifests pointed homepage at a domain that does not resolve; they now point at the repository.

Engines today: Google AI Overview, ChatGPT, Claude, Gemini, Yandex Alice / Нейро, DeepSeek — all live-validated. Perplexity has a playbook awaiting its first live-validation run.

Full changelog: v0.3.0...v0.3.1