history: add Italy 2019 cannabis-light derivatives ruling

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+# Italy audit: 2019 cannabis-light derivatives ruling added
+
+Research checked on 26 October 2026. Read `DATA-MAINTENANCE.md`, the
+`italy-home-growing-2019` and `italy-hemp-flower-ban-2025` entries with the
+profile, and the Wikipedia "Cannabis in Italy" legal history as a lead
+list before editing. One missing history item added; no scores, profiles
+or other timelines changed.
+
+## Audit result
+
+Wikipedia's dated legal events against the database: 1923 first law and
+schedule, 1934 decree, 1954 law, 1975 modest quantity, 1976 confinement
+case, 1980/1981 referendum validation, 1982 constitutional ruling, 1988
+import ruling, 1990 criminalisation, 1993 referendum, 1998 prescribing,
+2006 Fini-Giovanardi, 2007 decree, 2008 United Sections cultivation and
+Rastafari rulings, 2009 seed-food circular, 2012 seeds ruling, 2012
+Tuscany law, 2013 medical/Sativex/regional rulings/patient club,
+2013 indica-sativa trade, 2014 constitutional court and resentencing,
+2016 hemp law, 2017 army cannabis, 2019 home growing, 2021 initiative,
+2022 referendum block, 2023 decree annulment, 2025 flower ban — all
+present. The 2016 political debate and 2019 CAE report are debate-grade
+without new legal content; not added.
+
+## What changed
+
+- Added `italy-cannabis-light-derivatives-ruling-2019` (2019-05-30,
+  tightening, court/hemp, unscored context): the Court of Cassation ruled
+  en banc that selling leaves, flowers, oil and resin from industrial
+  hemp falls outside Law 242/2016 and is an offence unless devoid of
+  narcotic effect. Information note 30 May 2019; judgment 30475 filed
+  10 July. Mirrors the unscored treatment of the 2025 hemp-flower ban.
+
+## Sources actually read
+
+- IDPC (via EMCDDA), "Italy and Sweden: court decisions on low-THC
+  cannabis products", 1 August 2019: 30 May 2019 information note after
+  prosecutions of openly trading shops; Law 242/2016's exhaustive product
+  list; offence unless devoid of narcotic effects.
+- ADVANT Nctm, "Cannabis, even if light, is illegal", 2 August 2019:
+  Criminal Supreme Court en banc, judgment No. 30475, filed 10 July 2019.
+
+## Not done here
+
+- France 1991 MLC case and 1999 ATU sentence remain uncorroborated leads
+  (see Wikipedia cross-check note); Germany's 1994/1998 dronabinol
+  rescheduling likewise rests on Wikipedia alone.
+
+## Validation and tree note
+
+- Chain `it`: unchanged through 2019-12-19 23→26, 0 flagged steps; the
+  new entry is unscored hemp-market context like the 2025 ban.
+- `npm run history:test`: 40 pass, 0 fail. `npm run answers:test`: 40
+  pass, 0 fail. Production build: 4,358 pages, complete.
+- Commit stages only the new entry hunk plus this note, via patch
+  filtering. Foreign work in the shared tree is excluded and preserved.