history: add Luxembourg 1953 and Cyprus 1925 articles; cite BB/VC/LU/CY entries

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+# Research pass: Luxembourg 1953 + Cyprus 1925 articles; Barbados/St Vincent precision
+
+Research checked on 26 October 2026. Two new properly-sourced articles from
+primaries read in full (Luxembourg Mémorial PDF, three UN E/NL filings), plus
+precision upgrades with per-sentence citations to four entries. No scores,
+profiles or timelines changed.
+
+## What was verified (all sources actually read)
+
+- Luxembourg Mémorial A 1953 no. 72 PDF (6 pp., via Legilux filestore):
+  grand-ducal arrêté of 25 September 1953 executing the 28 April 1922 toxic
+  medicines law — Art. 1 (WHO-recognised addiction substances + preparations,
+  import/export only with prior health-minister authorisation, yearly list),
+  Art. 2 (holding/supply/acquisition/sale/manufacture licensing, revocable,
+  listed pharmacists/doctors/vets/depots excepted), Art. 18 (1922-law
+  penalties), repeal of 1922/1923/1952 orders, 1946 NY-protocol lineage; and
+  the 19 October 1953 ministerial order — Art. 1 item 25 (Indian hemp, resin,
+  extract, tincture), Art. 2 (external-use extract/tincture preparations
+  exempt). New `articles/luxembourg-indian-hemp-controlled-1953.md` (~360w,
+  4 sections). Entry gains [@1]/[@2] markers throughout.
+- UN E/NL.1949/20 (Cyprus), E/NL.1952/22 (Barbados), E/NL.1949/33
+  (St Vincent), all three PDFs fetched from documents.un.org and read:
+  1948 Cyprus Order in Council No. 2281 (s.11(2), amidone + Metopon, Indian
+  hemp in comparator clause proving s.11(1) base-list coverage); 1951
+  Barbados Application Order (s.10(2), 6 Dec 1951, Part IV import/export
+  licensing incl. non-external-use Indian-hemp extract/tincture
+  preparations); 1947 St Vincent Application Order No. 24 (s.13(2), made
+  25 Apr / gazetted 6 May 1947, Part V, same Indian-hemp preparation
+  wording). New `articles/cyprus-dangerous-drugs-law-1925.md` (~330w,
+  4 sections, all three filings as sources). Three entries rewritten to say
+  exactly what the filings prove, with the principal-text caveat kept.
+- Cyprus entry date error corrected: old text said "1947 order"; the filing
+  shows made 5 March 1948, deemed in force 1 January 1948.
+
+Claim boundaries: none of the three filings reproduces its principal
+Act/Ordinance/Laws, so base-list coverage is asserted only where the order
+text itself proves it (Cyprus s.11(1) via the comparator clause) and left
+open for Barbados/St Vincent. The Luxembourg article stays inside the 1953
+texts; the entry's old unsourced closing sentence ("use not an offence until
+the 1973 drug law") was removed because the 1973 text could not be verified
+this pass (Legilux ELI page is JS-rendered; EUDA country-report PDF fetch
+returned HTML). Re-adding it needs the 1973 Mémorial text.
+
+## Dead ends recorded, not forced
+
+- Luxembourg 1973 use-criminalisation point parked (see above).
+- No article from the Barbados/St Vincent orders alone: one operative
+  extension each is entry-grade, not article-grade, without the principal
+  Act texts.
+
+## Verification and files
+
+- `node -e` YAML load of changes.yaml clean before build.
+- `npm run build`, `npm run history:test`, `npm run answers:test` green;
+  rendered `/history/luxembourg-indian-hemp-controlled-1953/` and
+  `/history/cyprus-dangerous-drugs-law-1925/` citation marks checked.
+- Commit limited to own work: four entry hunks in changes.yaml, two new
+  articles, this note, via pathspec. Foreign staged/worktree files excluded
+  and preserved.