chore(release): add Apache-2.0 LICENSE and NOTICE

NOTICE lists the three SIL-OFL fonts the Flutter client bundles
(Space Grotesk, Inter, JetBrains Mono — fetched by app/setup.sh
from the upstream google/fonts repo) and the methodological
attributions that anchor the Studie: SKM (Normenkontrollrat),
the Coupette-2021 graph schema, QuantGov / RegData, Akoma Ntoso,
LegalRuleML, EU Better Regulation Toolbox, OECD iREG, UK RPC.

The Phase-0 demonstration corpus (five pilot norms in
lib/data/fixtures.dart) is also called out as plausibility-
graded approximation that is not NKR- or Beirats-validated —
the in-app banner shows T4 on every figure.

Signed-off-by: flemming-it <sf@flemming.it>

NOTICE

@@ -0,0 +1,61 @@
+F∆I Law-Heatmap
+Copyright 2026 Flemming.AI
+
+This product includes software developed by Dr. Stefan Flemming
+and contributors (https://flemming.ai/).
+
+------------------------------------------------------------------
+Embedded third-party material — fonts
+
+The Flutter client bundles three SIL Open Font License 1.1
+typefaces, downloaded by `app/setup.sh` from the upstream
+`google/fonts` repository under `ofl/`:
+
+  - Space Grotesk (display)
+      Copyright 2017 The Space Grotesk Project Authors
+      https://github.com/floriankarsten/space-grotesk
+  - Inter (body)
+      Copyright 2020 The Inter Project Authors
+      https://github.com/rsms/inter
+  - JetBrains Mono (monospace / technical IDs)
+      Copyright 2020 The JetBrains Mono Project Authors
+      https://github.com/JetBrains/JetBrainsMono
+
+All three are SIL OFL 1.1 — see assets/fonts/OFL.txt (added by
+setup.sh on first run).
+
+------------------------------------------------------------------
+Methodological lineage of the Studie
+
+Standardkostenmodell (SKM)
+  Nationaler Normenkontrollrat, Leitfaden zur Ermittlung und
+  Darstellung des Erfüllungsaufwands (current edition).
+
+Norm graph schema
+  Coupette, Beckedorf, Hartung, Bommarito, Katz,
+  "Measuring Law Over Time", Frontiers in Physics 9 (2021).
+  https://doi.org/10.3389/fphy.2021.658463
+
+Pflicht-Extraktion (deontic modality counting)
+  Mercatus Center / George Mason University, QuantGov /
+  RegData project. https://quantgov.org/
+
+XML format for legal texts
+  Akoma Ntoso 1.0 (OASIS LegalDocML).
+  https://docs.oasis-open.org/legaldocml/
+
+Better-regulation policy framework
+  European Commission, Better Regulation Toolbox.
+  OECD, Regulatory Policy Outlook (iREG).
+  UK Regulatory Policy Committee.
+
+------------------------------------------------------------------
+Demonstration data (assets/fixtures/ + lib/data/fixtures.dart)
+
+The five pilot norms shipped with the Phase-0 demo
+(GewO §14, KassenSichV, DSGVO Art. 30, BauO Bln §60 ff,
+MiLoG §17) cite publicly available BMJ, EUR-Lex and
+landesrecht-berlin.de URLs as primary sources. Numbers are
+plausibility-graded approximations and carry a permanent T4
+demo banner; they are explicitly NOT NKR- or
+Beirats-validated.