Website: list the machine estimator — menu, sitemap, FAQ and apps-page links; R-997 closed

noindex and the robots Disallow lines removed; both URLs in the sitemap with their hreflang pair; the pair
moves from UNLISTED to TWINS in site_gates.py. The explaining sentence's base figure was already the drawn
box's base; a test now pins it (red-proved).

scripts/CHANGELOG.md

@@ -1,3 +1,10 @@
+## 2026-10-13 (night) — site_gates: the machine estimator moves from UNLISTED to TWINS (R-997)
+
+- `site_gates.py`: the `gepigeny`/`en/sizing` pair is a normal twin; `UNLISTED` is empty and gate 25 stays for the next
+  such pair. The sitemap check now requires both URLs.
+- `test_build_sizing_web.py`: `test_sentence_base_is_the_drawn_box_base` (13 tests) — the sentence's base figure is the
+  bar box's base (4.0 GB at 8 GB, 4.6 GB for the household preset). Red-proved: a fixed 4,708 MB base fails it.
+
 ## 2026-10-13 (evening) — power-off spike on the N100: plugswitch, wall-power figures
 
 - New `scripts/bench/plugswitch.py` (`on`/`off`/`status`) + `test_plugswitch.py` (7 tests): `off` refuses unless 20 s of