docs(seo): implementation plan for W1, crawl hygiene and sitemap

Five tasks: one canonical host, canonicals on every route, noindex on
parameterised comparisons, a sitemap that drops dataless schools and invented
priorities, and a per-family sitemap index.

Planning turned up a fault the spec had missed: the apex 301s to www, but
metadataBase, the school-page canonical, robots.txt's Sitemap: line and every
sitemap <loc> named the apex. Task 1 fixes it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015mWQnpye9F299NVRCCSRvj
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TudorandClaude Opus 5 committed 2026-08-20 22:05:00 +01:00
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