history: add Uganda 1902 first-ban article from Hobley ethnography

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+# Uganda 1902: first article from the Hobley ethnography
+
+Research checked on 27 October 2026. Read `DATA-MAINTENANCE.md`,
+`WRITING.md` (article shape, citations, links), the Uganda timeline, the
+entry, the Hobley 1902 text (downloaded from archive.org, read all bhang
+passages), and the Wikipedia lead (local names, 2015 Act, 2023
+nullification). No entries, scores or profiles changed.
+
+## What changed
+
+- New `articles/uganda-ban-1902.md` (367 words, three sections): the 1902
+  blanket production ban against Hobley's household-cultivation ethnography
+  (gourd water-pipes, gender and age rules, Nandi abstention, tobacco
+  pairing), the njaga/shada local names, and the long afterlife through the
+  2015 Act and its 2023 nullification, linking both entries and the Uganda
+  profile. Hobley cited throughout; Wikipedia only for the ban wording, the
+  local names and the modern tail.
+
+## Sources actually read
+
+- Charles William Hobley, *Eastern Uganda, an Ethnological Survey*
+  (Anthropological Institute, 1902), archive.org djvu text: tobacco and bhang
+  grown for home consumption; hubble-bubble gourd pipes; men and unmarried
+  women smoke, married women stop; young fighting men barred; Nandi grow
+  nothing and smoke nothing.
+- Wikipedia "Cannabis in Uganda" lead and 1902 passage: ban wording (bhang,
+  ganja, charas), njaga/shada, 2015 Act, 2023 nullification. The BFSP vol. 95
+  ordinance text behind the ban remains unread (see the Finland/Uganda/Austria
+  note of the same day).
+
+## Validation and tree note
+
+- `history:test` 40/40, `answers:test` 40/40, `books:check` agrees,
+  production build 4371 pages complete, chain `ug` clean (1902 100→9).
+  New article file only; `changes.yaml` untouched this round.