sec05: EN downloads complete (30 files) + SUMMARY at-a-glance + lgdl queue infra

- 30/31 EN candidates downloaded via libgen, all content-verified
  (magic+pages+first-page text); 08b 37-pp fragment discarded
- EN gaps: 04/05/15/16/23 not found (rare academic), 03/14 ia-restricted
- MANIFEST.md: EN sections per item + not-downloadable extended
- 26 cards: Downloads tables w/ EN rows + EN NOT FOUND notes (6 cards)
- SUMMARY.md created (canon v1): at-a-glance table 29 items, EN->RU authors
- tools/lgdl.py: speed-probe + CDN-edge re-draw (per-request get.php
  302s to different storage hosts), connect timeout, stall wipe on first stall
- AGENTS.md: Lesson 9 (EN-queue infra: ads.php throttle, watchdog,
  unbuffered logs, dual-queue trap, AA 403, i2p verdict)

sections/05-ethnology/28-turner-the-ritual-process.md

@@ -22,6 +22,8 @@
 
 | lang | file | size | source |
 |------|------|------|--------|
+| EN | 28-turner-the-ritual-process-en-1991a.pdf | 23.2 MB | lg f/91830173 (111 pp, scan) |
+| EN | 28-turner-the-ritual-process-en-1991b.pdf | 19.1 MB | lg f/91883002 (223 pp) |
 | RU | 28-turner-the-ritual-process-ru-1983.fb2 | 1.3 MB | TOC-verified: «Ритуальный процесс. Структура и антиструктура» inside |
 
 ## Catalog records