Tool assessment pages

Assessment tools (e.g. ERP readiness) live under /tools/<slug>.

• URL pattern: /tools/<assessment-slug> (e.g. /tools/are-you-ready-for-an-erp-assessment)
• Adding a new assessment: Create src/pages/tools/<your-slug>.astro and add the route in sitemap/routes.ts under the “Tool assessments” comment. Other tools (PO generator, machine shop database, etc.) stay at their current root URLs.