Nextfix 0.2.0

Easier to install and to act on: the installer fetches the latest release and prints the Claude Code command,
Windows gets a double-click start file, and the ten most common tasks explain the fix in plain language with
WordPress hints. Windows is still not officially supported: installer and start file work there, the tests do not
pass reliably yet.

Added

• Plain-language fix guides for the ten most common tasks (thin content, page titles, descriptions, image text,
  pages not found, broken links, sitemap) and a new wordpress hint per check (Yoast, Rank Math, block editor),
  shown on the issue page, in the task list (API and MCP was_jetzt_tun) and in the PDF (#19).
• Double-click start file for Windows, Nextfix starten.bat: first start runs the installer, then it starts
  Nextfix and opens the browser; checked automatically on Windows (#18).
• The installer prints a ready-made claude mcp add command with the real install path (#17).
• ROADMAP.md: what is planned and what is deliberately not planned (#16).

Changed

• The one-line installer checks out the newest release tag instead of main; NEXTFIX_BRANCH=main (or any
  branch) for the development version. Running it again updates an existing install (#17).
• README explains why the MCP server is called seo-tool and keeps that name (#17).