WP Admin Agent Free 0.3.0

First clean GPL Free-edition release with 15 permission-checked tools, safe draft creation, Anthropic/Gemini/Ollama support, deterministic staging showcase provider, MCP-compatible endpoint, English documentation, verified screenshots, and an installable ZIP. Live fake-data showcase: https://wp-admin-agent-showcase-cd6tjmxetq-as.a.run.app/ — no administrator credentials or external AI-provider key are published.