Add Bolivia 1962 Narcotic Drugs Act penalty ladder (E/NL.1962/11)

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+# Bolivia 1962 Narcotic Drugs Act (new entry)
+
+- New `bolivia-narcotics-act-1962` (tightening, 1962-01-10, unscored):
+  Narcotic Drugs Act of 10 January 1962, Gaceta Oficial 7 Feb 1962,
+  communicated to the UN as E/NL.1962/11 under the 1931 convention.
+  Article 1(f): cannabis and galenical preparations. Penalties read in
+  full: art. 2 (3-12 years + fine for preparation/trade/supply, 70% to
+  informer, 30% to Health Ministry clinics); art. 3 (3-5 years possession
+  without lawful proof); art. 4 (premises = art. 2 penalties); art. 5
+  (+50% for officials, gangs, minors/mental/subordinate supply, medical
+  role, concurrent offences); art. 6 (6-10 years illness, 20 years death);
+  art. 7 (doctors over-prescribing = art. 2).
+- Unscored: comprehensive ladder inside the estimated prohibition
+  (window 1925-1950, in place by 1950 per UN 1951 survey); pre-1962 bands
+  unknown. Estimate retained as first scored step.
+- No article (single-instrument entry; backlog article slot stays with
+  higher-gap items). Chain bo 0 flagged.