Apply SEO and metadata best practices

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Summary

Expanded short frontmatter descriptions on v6 guide, reference, and start pages so they fall within the 130–160 character SEO target.

Changes

• Rewrote descriptions on guides/creating-an-environment, guides/running-an-eval, start/overview, and the reference/ pages (capabilities, cli, environment, runtime, tasks, training) with page-specific, searchable terms.
• All titles in scope already fit under 60 characters and are descriptive; no title changes needed.
• No duplicate descriptions among pages in scope.

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Note

Low Risk
Documentation metadata only; no runtime, API, or application code changes.

Overview
Updates only the YAML description field in frontmatter on nine v6 docs pages—no body copy, titles, or other metadata.

Each description is rewritten to be page-specific and keyword-rich (HUD, env.py, taskset, CLI, etc.) and sized for the usual ~130–160 character meta-description range. Pages touched: guides (creating-an-environment, running-an-eval), start (overview), and reference (capabilities, cli, environment, runtime, tasks, training).

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Docs PR opened: #476

Replaced the generic "Overview" title on the v6 start overview page with a descriptive title covering HUD core concepts and workflow.