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  lastmod MUST track the real last content change of each page, not the date this
  file was last touched. Google uses it to decide whether re-crawling is worth a
  slot, and a frozen date is read as "nothing changed here".

  This drifted once and cost real crawls: through 2026-09-02 every entry still read
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  so the 08-24 truth-audit copy and the 09-01 sameAs additions were invisible to
  Google for weeks.

  Run tools/check-sitemap-freshness.sh before any deploy that changes page content;
  it diffs these dates against `git log` and names anything stale.

  /policy/ and /tos/ are omitted DELIBERATELY (see brain note
  gsc-indexing-trailing-slash-2026-07-27): thin legal pages, Google already found
  them, and they do not need crawl budget spent on them.
-->
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