history: add Bahrain 1973 decree-law article from SHERLOC text

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+# Research pass: Bahrain 1973 decree-law article from SHERLOC text
+
+Research checked on 26 October 2026. Bahrain's 1973 replacement decree,
+already a fully-cited entry, gains a properly-sourced article from the
+decree text itself (UNODC SHERLOC English copy, 11 pp., read in
+extracted text). No entries, scores, profiles or timelines changed.
+
+## What was verified (all sources actually read)
+
+- Decree-Law No. 4 of 1973 (SHERLOC PDF): Art. 23 supply offences
+  (unauthorised import/export; cultivation/production/manufacture for
+  trafficking; dealing; 10 years / 10,000 dinars); Art. 24 personal
+  possession (3 years / 3,000 dinars; hospital-confinement alternative at
+  court discretion or minister recommendation); Arts. 25–26 record and
+  regulatory offences (3 months / 500 dinars); hospital circulation under
+  ministerial decision; Art. 31 fees; Art. 32 (1959 ordinance and
+  amendments cancelled); Art. 33 (ministers implement; in force on
+  gazette publication); schedule (Cannabis (Indian Hemp); cannabis resin);
+  signature Isa ben Salman Al Khalifa; Secretariat note E/NL.1959/52.
+- New `articles/bahrain-decree-law-4-1973.md` (~330w body, 4 sections,
+  single law source). The entry `bahrain-decree-law-4-1973` is untouched:
+  its [@1,2]/[@1]/[@1,3] citations already cover the same facts including
+  the 1959 comparison.
+
+Claim boundaries: two mid-draft cuts — the "previous maximum was three
+years" comparison and the forward link to the 1984/2007 laws belong to
+the entry's other sources, not to the decree text read here, so neither
+appears in the article.
+
+## Verification and files
+
+- No changes.yaml edit in this batch (article only); YAML untouched.
+- `npm run build`, `npm run history:test`, `npm run answers:test` green;
+  rendered `/history/bahrain-decree-law-4-1973/` citation marks checked.
+- Commit limited to own work: the new article and this note, via
+  pathspec. Foreign staged/worktree files excluded and preserved.