Add research page: how agents see MCP tools - #1790
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New public marketing page at /research/mcp-tool-visibility.
Presents the measured study of how five harnesses (Claude Code, Cursor CLI, Codex CLI, opencode stable/beta incl. code mode) present MCP tools to the model: per-harness context-window anatomy cards with real captured excerpts, provider-reported token costs for 31 per-integration search tools, and takeaways for MCP server authors.
Light-only, design.md tokens and existing marketing classes (eyebrow/section-title/surface-card/cap-grid/code-window). No new deps, no dynamic code beyond static Astro. Verified with astro build plus desktop and mobile screenshots on the dev server.