docs: add a Hobby path to the Agentic Check migration guide [AI-557]

[thebiglabasky]

What this adds

• A Hobby path in the Agentic Check migration guide. Hobby plans don't include the AI Assistant, so Hobby users replace each Agentic Check with their own AI agent connected to the Checkly MCP Server. There's an example prompt, and a hint to map {{VARIABLE_NAME}} references to process.env in the Browser Check script.
• In-product steps for paid plans. The AI Assistant steps use the new Copy prompt and Open AI assistant buttons on the Agentic Check page.
• A note for CLI-managed checks. Projects that manage the Agentic Check with the Checkly CLI replace the AgenticCheck construct in code; changes made in the app or through MCP are overwritten by the next deploy.
• Corrected AI invocation wording on the migration, automatic repair and Rocky AI pages. Each AI Assistant conversation now uses one invocation when it first runs. "Initialize from saved check" and MCP check creation still use none.

Decisions worth a look

• The guide splits by plan, not by preference: Trial, Starter, Team and Enterprise use the AI Assistant, and Hobby uses its own agent.
• The shared "verify and switch over" steps (run, enable automatic repair, deactivate) apply to both paths. Checks created through MCP have no intent, so the automatic repair step says to select Initialize from saved check first.

Merge order

Merge after checkly/monorepo#4304 deploys. That PR adds the Copy prompt and Open AI assistant buttons and gives paid plans the AI Assistant. The invocation wording is already accurate today.

Verification

mint broken-links: no broken links.

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