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     RULE (tied to screens/manifest.md · PL.7): this file lists ONLY ready-for-build screens. A screen's
     <url> is added the moment its Status flips to ready-for-build, and never before — we do not advertise
     pages that will 404. Canonical URLs match these <loc> paths exactly (spec §10 canonical rule).
     Regenerated from the manifest on each release (DR.3).

     READY-FOR-BUILD: 13 of 13 — the case-studies index and its three case pages flipped together at
     D254 (2026-08-13, the coupled flip, PL.12): the ResMed S+ page, the SleepScore SDK page and the
     Someone Like Me page. They ship in ONE push with llms.txt and the all-eleven rebuild, so no line
     here and no line there ever points at a 404. The three case <loc>s carry the signed slugs
     verbatim. Before that — the Defect Taxonomy article (D33), the Medical device software
     development page (D66), the Rescue page (D77), the Readiness page (D79), the Sample report (D79),
     Home (D87, 2026-07-11), and the three Writing screens (D131, 2026-07-28: the /writing reading-room
     index, the science-to-product essay and the cost article, flipped together as the three-way
     coupling required). The whole site is ready-for-build.
     Contact is a section of Home (/#contact), not a standalone page. -->
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