history: add USVI 1937 Tax Act article from EO 7715; upgrade entry

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+# Research pass: US Virgin Islands 1937 Tax Act article and entry upgrade
+
+Research checked on 26 October 2026. The territory's first cannabis ban
+gains a properly sourced article built from the Federal Register executive
+order read in full, plus a 1951 follow-up order; the entry is rewritten
+with per-sentence citations and a locator. No scores, profiles or
+timelines changed.
+
+## What was verified (all sources actually read)
+
+### Executive Order 7715 (Federal Register, 30 September 1937; via govinfo)
+
+- Roosevelt's order, signed 26 September and filed 29 September 1937:
+  section 15 of the Marihuana Tax Act (approved 2 August 1937, Public
+  No. 238, 75th Congress) directed presidential implementation in the
+  Virgin Islands. Mainland-mirror administration (finance commissioner for
+  internal revenue collectors; governor for the narcotics commissioner).
+  From 1 October 1937, importing, manufacturing, producing, compounding,
+  selling, dealing, dispensing, prescribing, administering, giving away or
+  acquiring marihuana without compliance was unlawful. Registration with the
+  finance commissioner; annual special taxes each July; 2-cent order forms;
+  Treasury-supplied transfer-tax stamps; mainland exemptions carried over;
+  governor's regulations to follow Treasury's as far as applicable;
+  inspection powers.
+- New `articles/us-virgin-islands-marihuana-tax-act-1937.md` (357 words,
+  3 sections, both sources cited; links /country/vi/). Entry rewritten
+  with the signed date and mirror-administration detail, locator added.
+
+### Executive Order 10250 (American Presidency Project, read)
+
+- Truman, 5 June 1951, section (f): the president's Virgin Islands
+  marihuana registration/tax powers (26 U.S.C. 2554(b), 2603(b)) delegated
+  to the Secretary of the Interior in consultation with the Treasury.
+  Used only for the article's closing paragraph; the 1951 entry itself was
+  left untouched.
+
+## Dead ends recorded, not forced
+
+- No article-length material beyond the two orders was sought; mainland
+  Tax Act politics (Anslinger etc.) deliberately excluded as out of scope.
+- Yugoslav 1929 code text still unrecovered (pravo.hr serves HTML to
+  scripts). Cameroon already has its 1926 French decree; Cuba comprehensively
+  covered by the 25 October pass; Ethiopia 1930 provisions still missing.
+
+## Verification and files
+
+- `node -e` YAML load of changes.yaml clean (run before build).
+- `npm run build`, `npm run history:test`, `npm run answers:test` all green;
+  rendered `/history/us-virgin-islands-marihuana-tax-act-1937/` citation
+  marks checked.
+- Commit limited to own work: the USVI hunk in changes.yaml, the new
+  article, this note, via pathspec. Foreign staged/worktree files excluded
+  and preserved.