Fill Solomon Islands 1940s and 1960s history gaps

@@ -1638,2 +1638,11 @@ interval; current scores and existing before-vectors are unchanged. The inherite
 1933 first-step allocation and the earlier Ottoman/republican transition remain
 open for joint reconstruction.
+
+A [Solomon Islands gap pass](research/history-solomon-islands-gap-2026-10-26.md)
+on 26 October 2026 adds the 1949 procedural amendment to the 1941 Regulation
+(read in the UN legislative series) and the 1965 extension of Britain's Single
+Convention ratification to the protectorate (read in the UN Treaty Collection
+volume). Both are scoreless context entries; related links join the 1941, 1949,
+1965 and 1982 entries, and one article covers the 1965 extension. Today's scores
+are unchanged. The 1953, 1967 and 1968 amendments and the 1978 legal notices in
+the reprint's endnotes remain unrecovered.

@@ -0,0 +1,78 @@
+# Solomon Islands: the 1949 amendment and the 1965 convention extension
+
+Research checked on 26 October 2026. Read `DATA-MAINTENANCE.md` and
+`WRITING.md`, the Solomon Islands profile and its five history entries before
+editing. No book was used. This pass fills the 1940s and 1960s of the
+1941–1982 gap with two dated entries and one article. Cameroon, Vietnam and
+the other active country passes were left untouched.
+
+## Sources actually read
+
+- The Dangerous Drugs (Amendment) Regulation 1949, No. 8 of 1949, as
+  reproduced in E/NL.1950/25 (United Nations legislative series under the
+  1931 Limitation Convention, communicated by the United Kingdom). Read the
+  full three-page PDF: made by the High Commissioner for the Western Pacific
+  on 27 October 1949, published and exhibited the same day, amending
+  section 39 of the Dangerous Drugs Regulation 1941 (No. 4 of 1941) by
+  inserting non-compliance with any provision into a court
+  compliance-order power. No definition or penalty changes.
+- UN Treaty Collection, Single Convention on Narcotic Drugs 1961,
+  multilateral treaties volume chapter VI-15 (PDF, read the parties and
+  territorial-application pages): United Kingdom notification of
+  26 January 1965, territorial application expressly listing the British
+  Solomon Islands among some thirty territories (Fiji, Tonga and the
+  Gilbert and Ellice Islands alongside Caribbean and African possessions).
+- The UNTC Single Convention status page (already cited by the 1982 entry):
+  independent Solomon Islands' succession deposited 17 March 1982.
+- The authorised Cap. 98 reprint (already in the file): sections 2, 4–8
+  (Indian hemp offences) and 39 (penalties) for the continuity claims.
+
+Deliberately not used: E/NL.1955/39 and E/NL.1955/43 (both read; they extend
+Part III to synthetic opioids, not cannabis); E/NL.1956/93 (read the head;
+it is Aden's ordinance, not the Solomons'); a CRL-gazette 1932 Dangerous
+Drugs Ordinance initially mistaken for a Solomons text (its enacting clause
+names Nyasaland — kept out of this pass entirely); search-result snippets
+about territorial succession mechanics (not relied on for any entry or
+article claim).
+
+## What changed
+
+- New `solomon-islands-dangerous-drugs-amendment-1949` (1949-10-27,
+  `other`, unscored): the procedural section-39 widening, with an explicit
+  no-cannabis-change reason. Fills the 1940s.
+- New `solomon-islands-single-convention-extension-1965` (1965-01-26,
+  `international`): the UK ratification's territorial application to the
+  British Solomon Islands, noting the 1982 succession. Fills the 1960s.
+- `solomon-islands-dangerous-drugs-act-1941`: related link to the 1949
+  entry. `solomon-islands-single-convention-1982`: one sentence noting the
+  earlier British cover, plus a related link. No scores touched — both new
+  entries are scoreless context, and today's profile scores did not change,
+  so the profile file was not edited.
+
+The timeline now has an entry in every decade from the 1940s except the
+1970s (independence fell in 1978 with no recovered cannabis-law change) and
+the still-estimated first restriction. The 1953, 1967 and 1968 amendments
+and the 1978 legal notices listed in the reprint's endnotes remain
+unrecovered; their contents are not described anywhere.
+
+## Article
+
+- `articles/solomon-islands-single-convention-extension-1965.md` (359
+  words, three headings): the extension, what it required, and the path
+  from British cover to 1982 succession, with links to the 1982 entry and
+  `/country/sb/`. No picture: no openly licensed image shows the subject
+  itself.
+
+## Validation
+
+- Parsed-history comparison of the working tree against HEAD: exactly two
+  entries added and two entries revised (related links plus one sentence);
+  no other country's entries changed, none removed.
+- `node scripts/data-status.cjs chain sb`: estimate only, no flagged steps.
+  `npm run scores:triage -- sb`: 1 scored, 0 open (the 1949 entry counts
+  as reviewed/unscored).
+- `npm run history:test`: 39 passed. `npm run answers:test`: 16 passed.
+- Production build passed (4,200 pages). Both new history pages render
+  with reference lists. Article: 359 words, three headings.
+- Concurrent agents' work in shared files is untouched; this commit stages
+  only the Solomon Islands hunks and files.