history: close Botswana 2025 low-level possession triage as reviewed unscored

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+# Triage: Botswana December 2025 low-level possession amendment closed as reviewed
+
+Research checked on 26 October 2026. Read `DATA-MAINTENANCE.md` (triage and
+timeline rules), the entry with the profile and timeline, and the segment
+band definitions before editing. No web search was needed: the decision
+rests on the entry's already-checked sources, the current profile and the
+published bands. One open triage item closed with an `unscored` reason; no
+scores, profiles or timelines changed.
+
+## What changed
+
+- `botswana-low-level-possession-amendment-2025` (2025-12-22, easing):
+  `unscored` — removing imprisonment for 60 g or less leaves prison
+  available above that amount (up to 3 years below 1 kg, up to 10 years
+  above), so enforcement stays at prison-possible and possession stays a
+  crime; no segment moves. The profile already describes the amended
+  thresholds.
+
+Triage now reports BW at 0 open (1922 100→11, 2025-12-22 11→12).
+
+## Validation and tree note
+
+- Chain `bw`: unchanged, 0 flagged steps.
+- `npm run history:test`: 40 pass, 0 fail. `npm run answers:test`: 40
+  pass, 0 fail. Production build: 4,356 pages, complete.
+- Commit stages only the `unscored` hunk plus this note, via patch
+  filtering. Foreign work in the shared tree is excluded and preserved.