Write Serbia 1930 Yugoslav-code article: hemp kingdom meets salon culture

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+# Serbia 1930 Yugoslav-code article (new, 474 words)
+
+- Wrote `articles/serbia-yugoslav-code-1930.md`: hemp kingdom (1700s Italian
+  strains; one-third of industrial-plant land; third producer in the world)
+  → code passed 27 Jan 1929, in force 1 Jan 1930, up to 6 months for serving
+  narcotics, Geneva ratified 4 Sept 1929 → Belgrade salons (police tolerance,
+  Russian staff, move to outskirts) + Skopje asrar scene (agha gardens,
+  Thessaloniki supply, coffee-house trade) → Ismailovic 1934 (enjoyment not
+  punishable, suspended sentence) + Kovin 1/1800 → six-month ceiling as base
+  layer.
+- Sources read: Medarevic & Djordjic 2024, Vojnosanit Pregl 81(4):247-252
+  (full PDF via ceon.rs: hemp area, salons with street names, asrar
+  preparation and trade spots, Ismailovic trial, Kovin/Vrapce data);
+  Wikipedia Serbia (1700s hemp, ratification date, code dates and penalty).
+- Dead ends kept: 1929 code's narcotics articles themselves unread
+  (modern-art-247 results only); Geneva ratification instrument not chased.
+- No changes.yaml edits; chain rs 0 flagged; history:test 41/41,
+  answers:test 69/69, build 4454 pages, rendered page verified.
+
+## Follow-ups (other owners' scope intact)
+
+- Six Yugoslav-code siblings (hr/si/ba/me/mk/xk) share the stub; a
+  reciprocal link from this article was limited to Serbia to avoid
+  over-claiming for entries not re-read.